Do kids sleep worse during a full moon? What parents should know

Kids hardly sleep worse during a full moon, if at all. The largest study, which tracked 5,812 children in 12 countries with activity monitors, found they slept just 4.9 minutes less per night around the full moon than around the new moon, and were no more active during the day. What does make full moon nights restless in some homes is usually simpler: bright moonlight through thin curtains, and parents who are a little short on sleep themselves.

You know the scene. It is the middle of the night, you are standing by the bed for the third time, and when you glance through the gap in the curtains, there it is: a big, round Moon. Of course. Teachers say it, grandparents say it, the parents at school pickup say it: kids go wild at full moon. This article covers what the research found, the most likely reasons for the nights that really are restless, how to turn the full moon into something your children look forward to, and what helps on the nights around it.

What did the big study of children find?

The question has been studied seriously, with a wink in the title. In 2016, a team led by Jean-Philippe Chaput of the Children’s Hospital of Eastern Ontario Research Institute in Ottawa, Canada, published “Are Children Like Werewolves?” in Frontiers in Pediatrics. They used data from 5,812 children aged 9 to 11 in 12 countries on every inhabited continent: Australia, Brazil, Canada, China, Colombia, Finland, India, Kenya, Portugal, South Africa, the United Kingdom and the United States. Each child wore an activity monitor on the waist around the clock for seven days in a row, which produced 33,710 full 24-hour recordings spread across 28 lunar cycles.

Children made a smart test group, Chaput explained, because they are more open to behavior changes than adults and need more sleep. If the Moon affects behavior at all, you would expect to see it in them.

The result: around the full moon, children slept 4.9 minutes less per night than around the new moon, about 1 percent of their sleep. Their daytime activity barely moved. Differences in active time and sitting time between moon phases were under two minutes a day and not statistically significant, and the pattern was the same across all 12 countries. The researchers themselves questioned whether such a small sleep difference means anything in practice. Chaput put it plainly: five minutes less sleep at full moon is not a considerable threat to health, behavior is shaped far more by genes, education, income and psychosocial factors than by gravitational forces, and there is no need to worry about the full moon.

Other studies do not even agree on the direction. A 2015 study of 795 Danish children aged 8 to 11, with more than 13,000 24-hour recordings, found that around the full moon they slept slightly longer, by about 2 to 4 minutes, and were a few minutes less active. A 2017 study of 1,411 German teenagers aged 14 to 17 found no link at all between the lunar phase and physical activity, sleep quality or time in bed. When one study finds a few minutes less and another a few minutes more, the honest conclusion is that there is no meaningful effect, and whatever remains disappears into the noise of an ordinary childhood.

Why does it feel like kids are wilder at full moon?

If the numbers are that small, why is the experience so strong? There are four good reasons, and none of them needs a magical Moon.

Moonlight through the curtains

A full moon sits opposite the Sun in the sky. It rises around sunset, stands high in the middle of the night and sets around sunrise, so it shines through exactly the hours your child is asleep. Children’s rooms often have light curtains, a night light and a door left ajar. Full moonlight is roughly 400,000 times fainter than sunlight, about 0.1 to 0.3 lux at the ground, but in a dark room a bright strip around the curtain can be enough to rouse a light sleeper. To see how that compares with a streetlight or a phone screen, read how bright moonlight really is.

Your own sleep

In a 2021 University of Washington study, people went to bed later and slept less in the three to five nights before a full moon, when the Moon is already bright after dusk. You can read more in the full moon and sleep. A parent who has slept a little less for a few nights experiences an ordinary interrupted night as much harder. Often the child is no more restless than usual. The parent is more tired.

Memory

Young children wake at night for all sorts of reasons: teeth, growth spurts, colds, bad dreams, or no reason at all. The Moon looks round for a few nights every month. So a rough night will sometimes land on a full moon by pure arithmetic. You remember that night, and forget the calm full moon night a month later.

Expectation

If you sigh at dinner that it is full moon and tonight will be a disaster, you head into bedtime tense, and children are quick to pick up on that. A bedtime run by a parent who expects trouble tends to become one.

Five minutes less sleep at full moon disappears into the noise of an ordinary childhood. What remains is light through a thin curtain and a parent who is a little short on sleep.

How to make the full moon fun for kids

Once the Moon stops being the villain, it can become the best free science lesson there is. Kids love the Moon, and a full moon is the easiest piece of astronomy around: big, bright and always on time.

• Watch it rise together. A full moon rises around sunset, and in winter that is well before bedtime, in December and January in the northern hemisphere and in June and July in the southern hemisphere. Find a spot with a clear view to the east and wait for it to appear above the rooftops, large and orange. Why it looks so big near the horizon is a famous puzzle, explained in the moon illusion.
• Talk about what you see. The dark patches are ancient lava plains, and the bright areas are older highlands. The Moon makes no light of its own but reflects sunlight, which is why it looks full when it sits opposite the Sun. Older kids will like knowing why we always see the same side of the Moon.
• Take a picture. Let your child try to photograph the Moon with a phone. It is harder than it looks, and these phone photography tips help.
• Find their birthday moon. The moon phase on your birthday tool shows how the Moon looked on the day your child was born. A crescent, a half, a full moon: children treat it as something that belongs to them.
• End with a story. A moon story in bed, curtains closed, light off. The Moon becomes the last chapter of a good evening instead of a reason to stay awake.

Tips for the nights around a full moon

For the nights themselves, the usual rules apply, with a little extra attention to light:

1. Make the room properly dark. Blackout curtains or blinds remove the most likely culprit. Pay attention to the evenings before the full moon too, when the Moon is already up and bright after dusk.
2. Keep the routine. Same bedtime, same order of steps: bath, teeth, story, light off. A steady routine is a stronger sleep signal for children than any phase of the Moon.
3. Dim the evening. Bright indoor lighting and screens do more to children’s sleep than moonlight. A calm, dim last half hour helps in every week of the month.
4. Do not announce a bad night. Children take on your expectations. If your child wakes anyway, do what you always do, calmly and briefly.
5. Look after yourself. Go to bed on time yourself in the evenings before a full moon. A rested parent has more patience on any night.

And as always: if your child sleeps badly for weeks, whatever the Moon is doing, talk to your child’s doctor. Children’s sleep problems almost always have an earthly cause.

Full moons in 2027 to watch together

Not every full moon suits young children equally. In summer the Moon rises late, after many kids are already asleep. Winter full moons rise early, which makes them the best family viewing of the year.

The Wolf Moon of Friday, January 22, 2027 is the supermoon of the year, the closest and brightest full moon of 2027, and falls on January 22 in every time zone. In the northern hemisphere it rises in the late afternoon or early evening, so you can watch it come up with the kids before dinner, and the next day is a Saturday. The Cold Moon of December 13, 2027 (December 14 in Australia) climbs higher in the northern sky than any other full moon of the year and shines all through the long night: lovely to look at, and exactly the night when good curtains earn their keep.

In Australia, New Zealand and South Africa, the midwinter Strawberry Moon of June 2027 plays that role. It falls on Saturday, June 19 in Australia, rises early and rides high in southern skies.

For rising times where you live, open each moon’s page, or see all twelve in the full moon calendar for 2027. Pick a few, put them on the family calendar and let your kids count down. A child who is looking forward to the full moon tends to lose a lot less sleep over it.