Infant sleep problems:
A parent's evidence-based guide
© 2008 Gwen Dewar, Ph.D., all rights reserved
Infant sleep problems can be frustrating. In part, that’s because we
feel so helpless to fix them. Babies have different sleep patterns than
adults, and these differences limit what we can do. For instance, we
can’t make a newborn sleep for 8 hours at a stretch. Nor should we try.
Babies have their own special physiological needs.
By the same token, we can’t approach baby sleep problems the same
way we approach sleep disorders in children. For example, researchers
warn that major behavioral interventions—like so-called “cry-it-out"
sleep training programs—are inappropriate for infants under 6 months of
age (Owens et al 1999; France and Blampied 1999).
But that doesn’t mean there is nothing you can do. For younger
babies, there are many safe, gentle tactics for improving sleep. And as
babies mature, your options increase.
In this article, I cover
• the most common infant sleep problems
• the most common behavioral causes of these problems
• strategies to improve infant sleep (including “cry it out" methods and their alternatives)
Infant sleep problems: The most common complaints
According to scientific studies of Western infants and their parents (Anders 1992), the most common infant sleep problems are:
• frequent, prolonged night-time awakenings,
• awakening too early in the morning, and, more rarely
• difficulty falling asleep at bed-time.
In some cases, these infant sleep problems are caused by
underlying medical conditions. Some of these medical conditions can be
dangerous, so it’s important to rule them out with the help of your
But researchers say that the majority of infant sleep problems
are caused by environmental factors. This article focuses on the
behavioral approach to infant sleep problems.
For information on sleep conditions that require medical treatment, see this overview of the most common
organic causes of infant sleep problems.
Troubleshooting: The behavioral causes of infant sleep problems
Defining an infant sleep problem depends a great deal on your baby’s
age. Newborn sleep patterns are necessarily different from those of
older children, and babies can’t be expected to sleep for lengthy
stretches of time--or consolidate most of their sleep at night--until
they are at least 3 months old. In fact, many healthy infants won’t
achieve these milestones until they are 6 months old.
So as you make your way through this list, keep in mind your
baby’s age. For instance, if your infant is 8 weeks old, it makes little
sense to worry about setting a strict bedtime. But it may be helpful to
keep your night-time soothing rituals calm and low-key.
In what follows, I begin with infant sleep problems that can
occur at any age. Then I cover infant sleep problems that apply to the
later months-—i.e., to infants old enough to sleep at least 5 hours at
Infant sleep problems that can occur at any age
1. Your baby’s internal clock is out of sync with the natural 24-hour day.
Most babies don’t develop strong, hormonally-driven circadian rhythms
until they are 12 weeks old, and some babies may take considerably
longer (Jenni and Carskadon 2005; Jenni et al 2006). But regardless of
your baby’s age, it makes sense to help her tune her internal clock.
Make sure she is getting exposed to sunlight during the morning and
afternoon, and keep her away from artificial lights before and during
bedtime. In addition, make sure she’s getting the appropriate social
cues about day and night. It may be hard for her to learn that the night
is for sleeping if she’s getting a lot of stimulation before bedtime
(see next item).
For more tips, see “How to help baby adapt to the
24-hour day" in my article about
2. Your baby is over-stimulated before bedtime
Physical exercise and other forms of excitement (like animated verbal
interactions) rev up the sympathetic nervous system—the system in
charge of keeping you alert. So it’s important to avoid these activities
before bedtime. Researchers recommend that parents make the last 2-3
hours before bedtime quiet and calm (e.g., Glaze 2004).
3. You are too quick to intervene at night
Babies sometimes make noises—-and may even cry out-—when they are
still asleep or only partially aroused. In fact, this can even happen
when a baby is experiencing deep sleep—-the part of the sleep cycle in
which he is least likely to awaken. If you jump in too soon, you might
actually find yourself waking a sleeping baby.
4. Your attempts to soothe the baby are too stimulating
Some parents may inadvertently cause infant sleep problems by making
too much of a fuss when they try to put baby back to sleep. If you want
your baby to go back to sleep quickly, avoid engaging your baby in a
social interaction. Remember—-interacting with you is the most
interesting part of your baby’s world! Instead, keep things dark, quiet,
5. You aren't consistent in your approach
Dealing with infant sleep problems can be exhausting and extremely
frustrating. As a result, anxious, sleepless parents may find themselves
alternating between overly stimulating soothing techniques and—-when
they are overcome with frustration or despair—-withdrawing from infants
altogether (France and Blampied 1999). This is confusing for the infant,
and may exacerbate infant sleep problems.
If you find yourself in this situation, take the time to create a
single, consistent approach to your infant sleep problems. Research
the science of infant sleep patterns
and then decide what approach(es) are best for you and your baby. It’s
hard to stick with a plan if you feel ambivalent about it. But once you
are clear about your own expectations, you may find yourself less
anxious and frustrated.
Infant sleep problems: After the first 6 months
1. Your baby's bedtime is too early
Parents sometimes overestimate infant sleep requirements, and/or
attempt to put babies to bed before they are sleepy. As a result, babies
have trouble falling asleep.
The remedy for this infant sleep problem is pretty obvious: Don’t put baby to bed until he’s actually sleepy.
But that’s easier said than done, because some babies seem to
become less sleepy the longer they stay awake (see below). Perhaps the
best approach is to review
the scientific evidence about baby sleep requirements
and signs of sleeplessness.
This will help you get a realistic estimate of your baby’s sleep needs.
If it seems that your baby’s bedtime really is too early, try the
gentle infant sleep training programs described below. Otherwise, see
the next section...
2. Your baby's bedtime is too late
As mentioned above, tired babies and children sometimes become more
active as the night wears on. This phenomenon—-called
“overtiredness"-—is widely reported by Western parents and baby experts
(e.g., Pantley; Ferber 2006). The remedy for this infant sleep problem
is straightforward. Review the information about baby sleep requirements
and signs of sleeplessness. Then pick an earlier bedtime and help your
baby wind down by introducing some soothing, low-key bedtime rituals.
3. Your baby lacks a regular bedtime
Western sleep researchers often cite irregular bedtimes as the cause
of infant sleep problems. According to their thinking, babies have
difficulty learning daily rhythms—and may even suffer a kind of “jet
lag"—if their bedtimes vary from day to day.
This seems to make sense. However, it’s not clear that fluid
bedtimes are perceived as a problem in other cultures.
bedtimes are pretty flexible in many places, from the highlands of
Guatemala (Morelli et al 1992) to Mediterranean Europe (Ottaviano et al
1996). And in many non-Western, non-industrialized societies, people
don’t observe fixed bedtimes from day to day (Worthman and Melby 2002).
Nor do they don’t try to satisfy all their sleep needs in one,
consolidated, night-time session. Instead, they sleep in shifts, and may
take naps during the day (Worthman and Melby 2002). For most of human
history, these patterns were probably typical (Worthman and Melby 2002).
So do irregular bedtimes really cause infant sleep problems? I
haven’t found any scientific studies testing the idea. Given that
strictly scheduled bedtimes are uncommon in non-Western societies, I
suspect that moderate variation—say, an hour or so either way—is no big
As long as your baby is getting enough sleep overall—and getting
consistent exposure to natural light cues—she’ll probably be fine. From
the perspective of maintaining good circadian rhythms, what’s more
important is waking up at roughly the same time each morning.
But it also seems plausible that large variations in bedtime
could cause infant sleep problems. If, for instance, they cause your
baby to wake up at different times each day, your baby may have
difficulty with his circadian rhythms. The problem may get worse if he
makes up for lost sleep by taking naps late in the afternoon or evening.
And if he can’t make up for lost sleep with naps, he may not meet his
4. Your baby is napping too late in the afternoon
It’s hard to fall asleep at night if you’ve only recently awakened
from a nap. A study of infants diagnosed with sleep disturbances
reported that babies needed less help falling asleep at night when
parents lengthened the time between the last nap of the day and bedtime
(Skuladottir et al 2005).
5. Your baby is hungry
Depending on the age of your baby, there may be little you can do
about this. Very young infants need to feed frequently (see infant
feeding schedule and breastfeeding on demand). However, you may increase
your chances of a lengthy nocturnal sleep bout if you feed your baby
between 10pm and midnight (Pinilla and Birch 1993).
In an experimental study of breastfed newborns, researchers
instructed parents to concentrate feeding their infants between 10pm and
midnight (Pinilla and Birch 1993). In addition, researchers instructed
parents to delay feeding their infants immediately after they awoke
during the night. (This was to be accomplished by doing other tasks—such
as changing diapers—first). By this tactic, parents were to gradually
increase the time between nocturnal feedings. Researchers also told
parents to provide infants with strong cues about day and night.
The intervention appeared to be very successful. Eight weeks
after training began, all infants in the treatment group were sleeping
quietly from midnight to 5am (Pinilla and Birch 1993). Only 23% of
control infants were doing so.
However, the study design doesn’t permit us to tell which of the
interventions were important. And we don’t know if the effect was
long-lasting. It’s also unclear if going 5 hours without feeding is in
the best interest of the 8-week old infant—particularly if the infant is
lower-weight. If you’re interested in trying all three aspects of this
approach on a very young infant, you should check with your pediatrician
But for older, larger infants, the approach may be appropriate.
And one aspect of the approach--encouraging babies to “tank up" before
bedtime--seems safe for babies of all ages.
6. Your baby doesn't know how to "self-soothe"
According to the ideal of most Western sleep researchers, babies
should learn how to fall asleep by themselves. And the way to achieve
this? Don’t let baby fall asleep in your arms. Instead, at bedtime, put
your baby in a crib before she has fallen asleep.
Advocates of this view have many studies on their side. When
babies fall asleep at the breast-—or are placed in cribs after they have
already fallen asleep—-babies are less likely to soothe themselves back
to sleep when they awaken again during the night (e.g., Anders 1979;
Anders et al 1992; Ferber 1986; Goodlin-Jones et al 2001).
Pediatrician and sleep researcher Richard Ferber argues that
parents who routinely soothe their young children to sleep are training
them to associate sleep with parental intervention (Ferber 2006). As a
result, children don’t develop their own self-soothing mechanisms. When
babies wake up during the night (and all babies do), they cry until
their parents come to their aid.
Is this really a problem? It depends on your expectations. From
an evolutionary and cross-cultural standpoint, soothing an infant to
sleep is the norm. And-—interestingly—-parents who don’t expect their
children to fall asleep by themselves are less likely to report that
their children have sleep problems (Morelli et al 1992). In part, this
may be because such parents co-sleep with-—and breastfeed—-their
infants. Night-time soothing episodes are probably less disruptive to a
mother’s sleep if her baby is within arm’s reach.
So it seems that each parent must decide for herself how
important self-soothing is. For more information about cross-cultural
patterns of infant soothing, see my article on
baby sleep patterns.
How to tackle infant sleep problems
For babies under 6 months old
As noted in the introduction, babies under the age of six months
aren’t good candidates for major sleep training programs. But you can
still do a great deal to prevent infant sleep problems. Try these safe
and gentle tactics:
• Establish regular day-time cues. Make sure baby is exposed to
daylight and daytime activity. Include baby in the daily hustle and
• Establish regular night-time cues. As bedtime approaches, shift
down from stimulating activities to more passive, sleepy, sedate
activities. Dim the lights. And you might introduce special bedtime
rituals—-like reading bedtime stories or singing lullabies.
• Massage therapy. Although a variety of cultures practice infant
massage, there has been little scientific research on its effects.
However, the limited evidence suggests that infant massage may help
babies adapt to the 24-hour day (Ferber et al 2002). In a study of
newborns, babies who received 14 days of massage therapy (beginning in
the second week of life) showed more mature sleep patterns later. At 12
weeks, the massaged infants had higher levels of nocturnal melatonin
• Bathe baby before bedtime—-if this seems to calm him down. A
warm bath signals the body to cool down, which aids sleep. But for some
babies, bathing is exciting.
• Tank up before bedtime. As noted above, babies may sleep for longer stretches at night if they have full tummies.
• Keep your night-time soothing techniques calm and low-key. Be
responsive but boring. Keep lights out, avoid making noise, avoid moving
the baby around, and avoid eye contact.
And for more solutions infant sleep problems, see this article on
infant sleep aids.
For babies over 6 months old
Older babies benefit from the same approach as younger babies do. But
because they are more mature, you might also consider these
gentle sleep training programs.
Because they don’t require babies to fall asleep alone, they minimize distress for both parents and infants.
Is "cry it out" a good solution to infant sleep problems?
If you’re dealing with infant sleep problems, you’ve almost certainly
heard about sleep training programs that involve some degree of “crying
These programs instruct parents to put their children to bed
(while children are still awake) and then leave them alone.
cry, parents are instructed to ignore their children for the rest of the
night (a method called “extinction") or for short intervals that may be
increased over time (a method called “modified" or “graduated"
Like other major behavioral interventions, these training
programs are considered inappropriate for infants under 6 months
(Owens et al 1999; France and Blampied 1999). For older infants, the
programs are controversial.
On the one hand, randomized, controlled studies show that
extinction and modified extinction programs are often successful, in
that the children who complete these programs are less likely to disturb
their parents at night (summarized in Mindell et al 2006). In addition,
studies that have attempted to measure the rate of daytime behavior
problems after treatment have shown no negative side effects (summarized
in Mindell et al 2006).
On the other hand, it’s clear that leaving infants to fall asleep
by themselves is not the norm for our species. Throughout human
evolution, babies have fallen asleep in the presence of their parents,
and, in the majority of modern human societies, babies continue this
pattern. For many parents, asking babies to fall asleep alone--and
permitting them to cry unattended--seems to violate their deepest
instincts. In fact, one of biggest problems with extinction sleep
training is that parents find it to be too upsetting (France and
Moreover, more studies are needed to assess the behavioral
effects of extinction training on infants. On close examination, I can
find only three extinction studies that measured the daytime behavior
for infants under 12 months of age (France 1992; Eckerberg 2004). In
these studies, infants under 12 months were treated together with older
children (ranging in age from 24 to 45 months). While the overall,
daytime behavioral outcomes were positive, it’s not clear how babies
under 12 months fared as a subgroup.
This shortcoming is important, because some researchers,
pediatricians, and parents are concerned about the psychological and
physiological costs of ignoring distressed infants at bedtime (e.g.,
Sears and Sears 1996). They point out that crying is associated with
physiological markers of stress (like elevated heart rate, blood
pressure, and cortisol levels) and reduced blood oxygen levels (Levesque
et al 2000; Luddington-Hoe et al 2002).
But keep in mind: We know that long-term stress
causes developmental problems. What we don’t know is what effect
short-term stress (associated with several nights of crying without
parental soothing) may have on infants.
Another concern is that infants under 12 months may not old
enough to understand that their absent caregivers haven’t abandoned
them. Starting around 6 months of age, babies begin to form strong
emotional attachments to their primary caregivers (Eliot 1999).
around 8 months, most babies begin showing signs of separation
anxiety—becoming distressed whenever they lose sight of their caregiver
(Eliot 1999). This is also the age when many infants that were
previously settled at night revert to night awakenings and crying spells
(France and Blampied 1999). The first year may be a bad time to try
sleep training methods that involve leaving babies to fall asleep by
These points lead pediatricians like William Sears to ask what a
baby who has undergone a “cry it out" programs has actually learned.
Certainly, the baby has learned that crying won’t bring her parents to
her aid. Possibly, she’s also learned that her parents are
insensitive—-that they can’t be trusted to respond to her needs (Sears
and Sears 1996).
Given these concerns, perhaps the more conservative approach is
to avoid sleep training methods that involve “crying it out" for infants
under 12 months. Even sleep researchers that recommend extinction and
modified extinction acknowledge that other methods--like
positive routines and parental presence with reduced contact--
may be as effective (Mindell et al 2006).
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If you found this article on infant sleep problems helpful, be sure to check out my other articles on baby sleep.
Content last modified 3/08