Does sleep make you taller? Not beyond the height your genes allow. Sleeping more won't add inches, but growing kids and teens do release a large share of their growth hormone during deep sleep, so regular, sufficient sleep supports normal growth. And you really are slightly taller when you wake up, by around three-quarters of an inch, but that's your spine, not growth, and it's gone by mid-morning.
So the honest answer is: sleep helps a growing body do its job, it can't override genetics, and adults can't sleep their way taller. To see how much sleep is right at each age, use the sleep by age calculator.
Free toolSleep Needs by AgeRecommended hours for every age, from newborns to over-65s.Does sleep make you taller?
No, not in the sense of making you taller than you'd otherwise be. Final adult height is set mostly by the genes you inherit, with nutrition and overall health also playing a part.
What sleep does is provide the conditions for normal growth. Think of it as one of the things a growing body needs, like enough food, rather than a lever you can pull for extra height. There's no good evidence that a child who already sleeps enough will grow taller by sleeping even more.
Why do people say you grow in your sleep?
Because growth hormone is released in its biggest burst shortly after you fall into deep sleep.
In a classic 1968 study, researchers drew blood every 30 minutes through the night from eight young adults while recording their brain waves. In seven of them, a large growth hormone peak appeared with the onset of deep sleep and lasted 1.5 to 3.5 hours. When falling asleep was delayed, the peak was delayed too, and people woken for a few hours who then went back to sleep showed another peak.
That's a small, old study in adults, so it doesn't prove that a missed hour of sleep shrinks anyone's final height. But it's the real science behind the saying: the body links a big pulse of growth hormone to deep sleep, and deep sleep comes mostly early in the night.
Are you taller in the morning?
Yes, a little. In a study of eight young adults, height varied by an average of 19.3 mm (about 0.76 inch, or 1.1% of height) between morning and evening.
The discs between your vertebrae are cushions that slowly compress under your body weight while you're upright, then re-expand when you lie down. In that study:
| What happened | Finding |
|---|---|
| Daily change in height | 19.3 mm on average (about 3/4 inch) |
| Share lost in the first hour after getting up | 54% |
| Share regained in the first half of the night | About 70% |
So if you measure yourself right out of bed, you'll get your tallest reading of the day. It isn't growth, and it isn't permanent. It's why pediatricians and sports teams try to measure at a consistent time of day.
How much sleep do kids and teens need to grow?
Follow the American Academy of Sleep Medicine ranges: 10 to 13 hours (including naps) at ages 3 to 5, 9 to 12 hours at 6 to 12, and 8 to 10 hours for teens 13 to 18.
| Age | Recommended sleep per 24 hours |
|---|---|
| 1 to 2 years | 11 to 14 hours, including naps |
| 3 to 5 years | 10 to 13 hours, including naps |
| 6 to 12 years | 9 to 12 hours |
| 13 to 18 years | 8 to 10 hours |
The same expert panel found that regularly sleeping less than the recommended amount is linked to attention, behavior and learning problems in children and teens, and to higher risk of accidents, injuries, high blood pressure, obesity, diabetes and depression. Those are reasons enough to protect a teen's sleep, whatever it does or doesn't do for height.
For a bedtime that fits a school alarm, the kids bedtime calculator does the math, and what time should a teenager go to bed has a full table for ages 13 to 17.
Can you grow taller after puberty by sleeping more?
No. Once the growth plates at the ends of the long bones close after puberty, sleep, stretching and supplements can't make bones longer.
Adults still benefit from good sleep in many ways, and you'll still be a bit taller each morning from your spinal discs. But there's no amount of sleep that adds permanent height to a grown adult. Be skeptical of any product or program that promises otherwise.
How to help a growing child or teen sleep well
Give them enough time in bed, a steady schedule and a dark, screen-free bedroom. That's what actually supports healthy growth and everything else.
- Set bedtime from the wake-up time. Work backward from the school alarm using the ranges above, plus about 15 minutes to fall asleep.
- Keep wake-up times steady on weekends, within about an hour or two if you can.
- Charge phones outside the bedroom. Late-night scrolling is one of the most common reasons teens fall short.
- Eat well and stay active. Sleep, nutrition and activity work together for growth.
Teens have a body clock that naturally runs later, which makes early bedtimes hard. How much sleep do teenagers need explains why and what helps.
When to talk to a pediatrician about growth
If you're worried that your child is growing too slowly, stopped growing, or is much shorter than family members would suggest, talk to their pediatrician, who can track their growth curve over time. Also check in if your child snores loudly most nights, has pauses or gasps in breathing during sleep, or is very sleepy during the day despite enough time in bed. Don't try to fix a growth concern with extra sleep or supplements on your own.