Screens and toddler sleep: what to do
By Adam Linmore · November 2, 2026
Start with what the research does not say. It does not say that a screen in the evening has damaged your child, or that a tired family has done something wrong. Most of the studies below measured sleep and screens at the same moment, and they cannot say which came first. A baby who sleeps badly may be handed a screen more often, and a screen may also take sleep. Both can be true. What the research does offer is a short list of ways an evening screen can get in the way, and one bedtime rule that nearly every guideline shares.
Why sleep matters at this age
A toddler needs eleven to fourteen hours of sleep in a day, naps included, and her brain does much of its work on the day’s learning while she sleeps. Two experiments show this in babies directly. In one, infants of six and twelve months were shown how to do something new with a puppet and then either napped or stayed awake for the next few hours. The ones who napped remembered it the next day, and the ones who did not had largely forgotten. In another, infants of nine to sixteen months were taught new names for groups of similar objects. After a nap, but not after the same time awake, their brain responses showed that they remembered the names and applied them to new objects of the same kind.
So a toddler who sleeps less is not only tired. She also has less time to store what she learned.
First, screens take time
The simplest way is the plainest. An hour of screen in the evening is an hour that was going to be the bath, the book and the dark.
In a large study of touchscreens and sleep in the very young, parents of 715 British children between six and thirty-six months reported their children’s daily tablet and phone use and their sleep. Each hour a day of touchscreen use went with about a quarter of an hour less sleep in twenty-four hours. Night sleep was shorter and daytime sleep was longer, which made up some of the loss. Children who used touchscreens more also took longer to fall asleep. In an American national sample of more than 2,000 children under three, each hour of television a day went with a more irregular schedule for naps and bedtimes. A review of 31 studies of children under five found more screen time going with shorter and poorer sleep, with the usual caveat that nearly all of it was observational.
These are associations. They show a pattern, not a cause.
Second, what she watches follows her to bed
Scientists use the word arousal for being stirred up. Among 612 American preschoolers, evening screen use and violent content, even cartoon violence, went with more sleep problems, and a television in the bedroom went with more still.
The same team then ran a trial, which observational researchers rarely do. Families of 565 preschoolers were randomly assigned either to a program that helped parents swap violent and age-inappropriate shows for calmer ones, without reducing the total, or to a nutrition program as a comparison. Six months later the children in the media group had fewer sleep problems, though the benefit faded after the program ended. Content is not everything, but it is something a parent can change right away. In Thailand, among 208 babies followed from six to twelve months, those with screens on in the evening at twelve months slept about half an hour less at night.
Third, light
The screens of phones and tablets give off bright light rich in blue, and blue light in the evening tells the brain’s clock that it is still day. In a laboratory study of adults, reading a light-emitting tablet for a few hours before bed, compared with reading a printed book, suppressed the sleep hormone melatonin, pushed the body’s clock later, lengthened the time it took to fall asleep and left the readers less alert the next morning.
That study was in adults, and nobody has run it in toddlers. It is a reason to think about the light, not a measurement of your child.
What the guidelines agree on
The British guidance of 2026, like the American Academy of Pediatrics’ guidance of 2016, advises no screens in the hour before bed. Where guidelines give a rule for the evening, it is that one.
There is a trial behind it. British families of toddlers were randomly assigned to remove screens in the hour before bed, and they did. Their toddlers’ measured sleep improved a little over the trial’s few weeks, with no change in attention. The gain was modest, and the trial was short. It is still a trial, and it points where the rest of the research points.
What replaces the screen
What replaces the screen at bedtime is the oldest thing in child-rearing, and it has been measured. Among more than 10,000 mothers of children aged five and under in fourteen countries, the children with a consistent bedtime routine, the same bath, book and song in the same order, fell asleep earlier and faster, woke less and slept longer. The more nights a week the routine was kept, the larger the difference.
A routine is a sequence the body learns. A screen in the middle of it breaks the sequence, because what comes out of a screen is different every night.
Here is a plan for this week:
Pick the hour. Count back one hour from the time she usually goes to bed. From then on, no screen for her, and, if you can manage it, none for you.
Make the order the same. Bath, book, song, dark: any order that suits your house, kept the same every night. Say the steps aloud so she can learn them.
Move the screens out of the bedroom, and keep a television out of the room where she sleeps.
If there is a show earlier in the evening, choose a calm one about ordinary things, and have it end well before the hour begins.
Give the hour something to do. A pile of blocks on the floor, a bath with cups, a book read twice. A quiet hour needs a plan more than it needs willpower.
Expect a noisy first few nights. Taking away the evening screen can make that hour worse at first. The noise is not a sign she needed the screen. It is a sign she has not yet learned the other way, and the first week is where she learns it.
Keep it on weekends, as far as you can. The routine works by being the same.
If you are worried
If anything about your child’s sleep, looking, pointing, talking or play worries you, or she has lost a skill she had, talk with your child’s doctor now, and ask for a hearing test first. No parent is to blame for a child’s sleep or development, and a hard evening is nobody’s fault; the pattern can be changed at any point. “Virtual autism” is not a medical diagnosis; if that phrase brought you here, read what it means.
Sources: Seehagen et al. 2015; Friedrich et al. 2015; Cheung et al. 2017; Thompson and Christakis 2005; Janssen et al. 2020; Garrison, Liekweg and Christakis 2011; Garrison and Christakis 2012; Vijakkhana et al. 2015; Chang et al. 2015; Mindell et al. 2015; Pickard et al. 2024. Full references are in chapters 8 and 10 of Virtual Autism; the sources page lists the key studies behind this site.
Written with AI assistance and checked against the cited sources.
Want the full picture? Virtual Autism sets out the research, its limits and a practical plan for home.
General information, not medical advice. If you are worried about your child, talk to your child’s doctor.