Quick answer
The American Academy of Sleep Medicine recommends 9–12 hours a night for ages 6–12 and 8–10 hours for teens, and kids who train hard belong at the top of that range. In a small Stanford study, college swimmers who slept about 10 hours a night got faster off the blocks, in a 15-metre sprint and on turns. Morning practice makes that hard, so protect bedtime first.
Most evenings after practice, Rafa falls asleep in the back seat before we even make it home. Head against the window, still in her parka, out cold. That image, my fourteen-year-old too exhausted to stay awake for a fifteen-minute drive, is what made Michelle and me restructure our family schedule. Dinner earlier, screens off by eight, everything built around making sure she gets nine-plus hours.
If you are juggling training, school, and bedtime in your house, I get it. Here is what we learned, and what the science says.
For young athletes, sleep is not just rest. It is where a lot of the training actually sticks.
How many hours, by age
The American Academy of Sleep Medicine (AASM) published consensus recommendations for children and teens [1]:
| Age | Recommended sleep per night |
|---|---|
| 6 to 12 years | 9 to 12 hours |
| 13 to 18 years | 8 to 10 hours |
These are general health targets, not athlete targets. A swimmer who trains most days has more to recover from than a classmate who does not, so aiming for the upper half of the range makes sense. A 2024 editorial in Sports Health makes the same point: sleep is part of recovery, and many athletes do not get enough of it [2].
Why does it matter so much? Sleep is when the body repairs muscle, releases growth hormone and consolidates motor skills. A swimmer can practise a flip turn all week, and much of the learning is locked in overnight. Cut sleep short and some of those reps go to waste.
The Stanford swimmer study
In 2008, Dr. Cheri Mah and colleagues at Stanford presented a study at SLEEP 2008, the main annual sleep-research meeting in the U.S. [3]. Five swimmers from the Stanford varsity teams kept their normal schedule for two weeks, then extended their sleep to 10 hours a day for six to seven weeks. At the end, on average, they:
- swam a 15-metre sprint 0.51 seconds faster
- reacted 0.15 seconds faster off the blocks
- improved turn time by 0.10 seconds
- reported less daytime sleepiness, more energy and better mood
Half a second over 15 metres is a lot in a sport decided by hundredths. Two honest caveats: it was five college athletes, not age-groupers, and it was presented as a conference abstract. The same group later published a larger sleep-extension study with Stanford basketball players, which found faster sprints and better shooting accuracy [4]. Put together, the message is consistent: more sleep, better performance.
The morning practice problem
Every swim family knows the tension: morning practice often starts at 5:00 or 5:30 AM. That means a 4:30 alarm, maybe earlier. Ten hours of sleep would mean being asleep by 6:30 PM the night before.
That is not realistic. No teenager is going to bed at 6:30 PM.
So what can you do?
- Protect bedtime on school nights. Even if 10 hours is out of reach, every 30 minutes earlier adds up to hours over a week.
- Use weekends to catch up, gently. A longer night on Friday or Saturday helps, but keep the wake-up time within reach of the weekday one, or Monday gets harder.
- Use naps. A short nap after school, before afternoon practice, can help alertness. Naps are one of the tools the Sports Health editorial recommends for athletes [2]. Keep them short and early so they do not push bedtime later.
- Talk to the coach about the whole week. If two-a-days are eating into the nights, that is a load question the coach should hear about.
Sleep does not show up in any app, but its effect can show up on the clock. If a stretch of early practices and late homework seems to be costing your swimmer, sign in and open Best Times in Gophin, then select one event to see its history: a flat or falling line during a heavy school month is worth a conversation with the coach. It is free.
Screens and bedtime
The American Academy of Pediatrics advises putting all screens away at least an hour before bedtime and charging devices outside the bedroom overnight [5]. The blue light from phones and tablets can hold back melatonin, the hormone that tells the brain it is time to sleep, and scrolling or gaming keeps the brain alert.
The easiest way to make it stick is a charging spot in the kitchen. When the phone sleeps outside the bedroom, the temptation goes with it.
A better sleep routine
Good sleep does not happen by accident, especially for busy athletes. Habits that help:
- The same bedtime and wake time, even on weekends when possible
- A cool, dark, quiet bedroom. Blackout curtains help with early summer sunrises.
- A wind-down routine: reading, stretching or a warm shower. Something that tells the body the day is over.
- No big meal right before bed. A light snack is fine; a full dinner at 9 PM makes it harder to fall asleep.
- No caffeine after lunch. The AAP recommends teens avoid caffeine after lunchtime, because it can stay in the body for more than eight hours [5]. That includes energy drinks, which some older swimmers reach for to cover the sleep they are not getting.
The conversation worth having
If your child is consistently tired, moody, struggling in school or stuck in the pool, look at sleep first, before training volume, before nutrition. It is the cheapest change a young athlete can make.
You do not need a sleep lab. You need an honest look at what time your child actually falls asleep and wakes up. If that is below the AASM range for their age on most nights, there is room to improve.
Sleep is not the opposite of training. It is part of it.
Gophin does not track sleep. It tracks official race times. If a stretch of short nights lines up with a stall on the clock, you will see it when you sign in and open Compare → Seasons, which puts this season next to last season, event by event. It is free. Fix the nights first.
Sources
- Paruthi, S., et al. (2016). "Recommended Amount of Sleep for Pediatric Populations: A Consensus Statement of the American Academy of Sleep Medicine." Journal of Clinical Sleep Medicine, 12(6), 785–786. aasm.org (PDF)
- Asplund, C.A. (2024). "The Importance of Sleep for Health and Athletic Performance." Sports Health, 16(4), 499–500. pmc.ncbi.nlm.nih.gov/articles/PMC11195859
- American Academy of Sleep Medicine (2008). "Ongoing Study Continues to Show that Extra Sleep Improves Athletic Performance" (Mah, C.D., et al., abstract presented at SLEEP 2008). aasm.org
- Mah, C.D., Mah, K.E., Kezirian, E.J. & Dement, W.C. (2011). "The effects of sleep extension on the athletic performance of collegiate basketball players." Sleep, 34(7), 943–950. pubmed.ncbi.nlm.nih.gov/21731144
- American Academy of Pediatrics, HealthyChildren.org. "My teen is having trouble falling asleep at night. How can I help?" healthychildren.org
