How to Help Children Sleep Better: What the Research Actually Shows

Sleep is one of the most important contributors
to children’s health, development, and wellbeing —
and one of the most common sources of parental
exhaustion and frustration. Research on children’s
sleep is among the most robust in all of
developmental science, with clear, consistent
findings about what children need, what helps,
and what gets in the way.

This article covers what the research shows
about children’s sleep across different ages,
what the evidence supports for helping children
sleep better, and what the most common
sleep-disrupting mistakes are.

Why Sleep Matters So Much

Research on sleep and child development
is consistent and striking. Sleep is not
simply rest — it is an active, essential
biological process during which the brain
consolidates learning and memory, the body
repairs and grows, and the regulatory
systems that govern emotion and behavior
restore themselves.

Research by Matthew Walker at UC Berkeley
on sleep and brain function finds that
sleep deprivation impairs virtually every
cognitive function — attention, memory,
learning, emotional regulation, and
decision-making — in ways that accumulate
over time and are not fully compensated
by catching up on weekends.

Research specifically on children and sleep
finds that inadequate sleep is associated with:

Behavioral difficulties — increased
irritability, aggression, and emotional
dysregulation. Research by Avi Sadeh
at Tel Aviv University finds that even
modest sleep restriction — one hour
less than usual — produces significant
increases in behavioral difficulties
in school-age children.

Academic difficulties — reduced attention,
slower processing, and worse academic
performance. Research consistently finds
that children who sleep less learn less —
because sleep is when the brain consolidates
the learning of the day.

Physical health impacts — disrupted
sleep is associated with increased
risk of obesity, immune dysfunction,
and growth hormone disruption,
which is primarily released during
deep sleep.

Mental health — chronic sleep
insufficiency in children is
associated with elevated rates
of anxiety and depression,
in a bidirectional relationship:
poor sleep worsens mental health,
and mental health difficulties
worsen sleep.

How Much Sleep Children Actually Need

Research on sleep requirements across
childhood — synthesized in guidelines
from the American Academy of Sleep Medicine —
identifies the following recommended ranges:

Infants (4-12 months): 12-16 hours
including naps.

Toddlers (1-2 years): 11-14 hours
including naps.

Preschoolers (3-5 years): 10-13 hours
including naps.

School age (6-12 years): 9-12 hours.

Teenagers (13-18 years): 8-10 hours.

Research by Jean Twenge at San Diego
State University on trends in children’s
sleep finds that most children in
developed countries are sleeping
significantly less than these recommended
amounts — with school-age children
averaging approximately one hour
less than recommended and adolescents
averaging significantly more.

What the Research Shows Works

The consistent bedtime routine.
Research by Jodi Mindell at
Children’s Hospital of Philadelphia —
one of the leading researchers
in pediatric sleep — finds that
a consistent, calming bedtime
routine is one of the single
most evidence-based sleep
interventions available.

Mindell’s research on bedtime
routines across multiple countries
and age groups finds that children
with consistent bedtime routines —
a predictable sequence of
three to four calming activities
beginning at the same time
each night — fall asleep
faster, wake less frequently
overnight, and sleep longer
than those without consistent routines.

The specific activities matter
less than the consistency
and the calming quality.
A bath, pajamas, teeth brushing,
and a story — in the same
order, at the same time,
every night — is a highly
effective sleep routine.

Consistent sleep and wake times.
Research on circadian rhythm
and sleep quality finds that
consistent sleep and wake times —
including on weekends — produce
significantly better sleep quality
than variable schedules. The body’s
internal clock is set by consistent
timing, and irregular schedules
disrupt this clock in ways that
make falling asleep and waking
refreshed significantly harder.

The temptation to let children
stay up later and sleep in
on weekends is understandable —
but research finds that the
resulting “social jet lag”
disrupts sleep quality
across the week.

The sleep environment. Research
on sleep environment and sleep
quality finds several consistent
factors:

Darkness — even small amounts
of light suppress melatonin
and delay sleep onset.
Blackout curtains or a
good quality sleep mask
produce measurable improvements
in sleep onset and sleep quality.

Cool temperature — research
finds that a slightly cool
room (around 65-68°F /
18-20°C) supports better
sleep than a warm room,
because the body’s core
temperature naturally
drops during sleep.

Quiet or consistent sound —
complete silence is not
necessary and is sometimes
harder to maintain.
White noise or consistent
background sound can
actually improve sleep
by masking disruptive
intermittent sounds.

No screens in the bedroom —
research on bedroom media
and sleep finds that the
presence of a screen in
the bedroom — even when
not actively used —
is associated with shorter
sleep duration and later
bedtimes.

Screens off before bed.
Research on screen light
and melatonin — including
work by Mary Carskadon
at Brown University —
finds that the blue-wavelength
light emitted by screens
suppresses melatonin production
and delays sleep onset.
Research finds that screen
use in the hour before
bed delays sleep onset
by an average of thirty
to sixty minutes.

A consistent, firm screen-off
time — at least thirty
to sixty minutes before
the target sleep time —
is one of the most
evidence-based sleep
interventions available
for school-age children
and adolescents.

Physical activity during the day.
Research on physical activity
and sleep quality in children
finds consistent positive
associations — children who
are more physically active
during the day fall asleep
faster and sleep more deeply
than those who are less active.
The timing matters: vigorous
exercise close to bedtime
can delay sleep onset for
some children, while daytime
and early evening activity
generally improves sleep.

Addressing sleep anxiety.
Research on anxiety and
children’s sleep finds that
anxiety is one of the most
common drivers of bedtime
resistance and night waking
in children. Children who
worry at bedtime — about
school, about friendships,
about family concerns,
about imagined fears —
need both the practical
sleep supports described
above AND attention to
the underlying anxiety.

Helpful approaches for
anxious bedtimes include:
a brief “worry time” earlier
in the evening where worries
can be named and written down;
a gratitude or positive
reflection practice at bedtime
that directs attention toward
the good; and warm, brief
reassurance that does not
extend indefinitely.

Common Sleep Problems and
What the Research Shows

Bedtime resistance. Research
on bedtime resistance finds
it most commonly driven by
one of three factors: the
sleep timing is too early
for the child’s natural
sleep pressure (try pushing
bedtime slightly later);
the child has learned that
resistance produces extended
parental attention (consistent,
warm but brief response
to curtain calls); or
the child is anxious
(address the anxiety directly).

Night waking. Research on
night waking in children
beyond infancy finds it
most commonly associated
with sleep associations —
the child has learned to
fall asleep under conditions
(parental presence, feeding,
screens) that are not
available when they naturally
rouse between sleep cycles
overnight. Teaching children
to fall asleep independently
at bedtime is the most
evidence-based approach
to reducing night waking.

Early waking. Research on
early morning waking finds
it most commonly driven
by light exposure (blackout
curtains are the first
intervention), by a sleep
schedule that is too early
overall, or by the child’s
natural chronotype —
some children are simply
natural early risers.

Adolescent sleep difficulties.
Research on adolescent sleep —
including work by Mary Carskadon —
finds that puberty produces
a genuine biological shift
in circadian rhythm, making
adolescents naturally inclined
to fall asleep later and
wake later than younger
children or adults.
This is not laziness or
defiance — it is a
documented biological change.

School start times that require
early waking work directly
against this biological
shift, producing chronic
sleep deprivation in most
adolescents. Where school
start times cannot be changed,
the evidence-based response
is to protect sleep as
much as possible — strict
screen curfews, consistent
weekend schedules, and
advocacy for later school
start times where possible.

What Does Not Help

Inconsistent responses to
night waking or bedtime
resistance. Research on
behavioral approaches to
sleep problems finds that
inconsistency — sometimes
responding to night calling,
sometimes not; sometimes
allowing a child into the
parental bed, sometimes not —
produces the most persistent
sleep difficulties. Consistency
is the single most important
feature of any behavioral
sleep intervention.

Screen use as a sleep aid.
Many parents report using
screens — tablets, phones,
television — to help children
wind down before bed.
Research finds this
counterproductive: screens
suppress melatonin, increase
arousal through engaging content,
and associate the pre-sleep
period with stimulation
rather than calming.

Caffeine. Research on caffeine
and children’s sleep finds
that even moderate caffeine
consumption — from cola,
energy drinks, tea, or
chocolate — significantly
disrupts sleep in children,
who metabolize caffeine
more slowly than adults.
Caffeine consumed even
six hours before bedtime
can measurably disrupt sleep.

The Bottom Line

Children’s sleep is not
a luxury or a parenting
battlefield. It is a
biological necessity that
shapes every aspect of
their development, health,
and wellbeing.

The research is clear
about what helps:
a consistent, calming
bedtime routine;
consistent sleep and
wake times; a dark,
cool, quiet bedroom;
screens off before bed;
physical activity during the day;
and warm, consistent
parental response to
the inevitable sleep
challenges that arise.

None of these is complicated.
All of them require consistency —
which is the hardest part,
and the most important.

A child who sleeps well
is a child who learns better,
behaves better, feels better,
and grows better.
The investment in sleep
pays dividends in every
other domain of their life.

Sources

Mindell, J. A., Kuhn, B.,
Lewin, D. S., Meltzer, L. J.,
& Sadeh, A. (2006).
Behavioral treatment of
bedtime problems and night
wakings in infants and
young children. Sleep,
29(10), 1263–1276.

Sadeh, A., Gruber, R., &
Raviv, A. (2003). The effects
of sleep restriction and
extension on school-age children.
Child Development, 74(2),
444–455.

Carskadon, M. A. (2011).
Sleep in adolescents:
The perfect storm.
Pediatric Clinics of
North America, 58(3),
637–647.

Walker, M. (2017).
Why We Sleep.
Scribner.

American Academy of
Sleep Medicine. (2016).
Recommended amount of
sleep for pediatric populations.
Journal of Clinical Sleep
Medicine, 12(6), 785–786.