Most adults need at least 7 hours of sleep a night. That’s not a rough guess. It’s the conclusion of a joint consensus statement from the American Academy of Sleep Medicine (AASM) and the Sleep Research Society (SRS), based on a review of more than 5,300 scientific studies.
If you’re consistently sleeping less than that, you’re not toughing it out. You’re running a health deficit.
The short answer
- Adults 18 to 60: at least 7 hours per night
- Adults 61 to 64: 7 to 9 hours per night
- Adults 65 and older: 7 to 8 hours per night
These ranges come from the CDC, built on the same AASM/SRS consensus work. There’s no firm upper limit, but the panel noted that regularly sleeping more than 9 hours may signal something else going on, like illness or unpaid sleep debt, rather than being a target to aim for.
Why “at least 7” and not a wider range
You’ll see 7 to 9 hours quoted a lot, including by the Sleep Foundation and National Sleep Foundation. That range is a reasonable ballpark. But the actual medical consensus statement is more specific: 7 or more hours, with the panel choosing not to recommend a strict ceiling.
The bigger point either way is the floor, not the ceiling. Short sleep is the piece with the clearest, best-documented health cost.
What happens when you sleep less than 7 hours
The CDC’s national data ties short sleep to higher risk for:
- Obesity
- Type 2 diabetes
- High blood pressure
- Coronary heart disease
- Stroke
- Frequent mental distress
- Accidents, including drowsy driving
This isn’t rare. As of the most recent national data, more than 1 in 3 US adults report not getting enough sleep, and the rate is even higher, close to 4 in 10, among adults 45 to 64.
Does it change with age
Sleep need doesn’t drop off a cliff after 60, but it does shift slightly. Older adults still need 7 hours or more. What often changes is sleep quality, not the requirement:
- Less time in deep, slow-wave sleep
- More nighttime awakenings
- A tendency to fall asleep earlier and wake up earlier
- Higher rates of sleep disruptors like sleep apnea, restless legs, nighttime urination, and pain
If you’re older and sleeping 7 hours but still feel exhausted, the problem is usually quality or an underlying sleep disorder, not that you naturally need less sleep. That “you need less sleep as you get older” idea is a myth the National Institute on Aging pushes back on directly.
Practical takeaways
- Treat 7 hours as a floor, not a stretch goal. If you’re consistently under that, it’s worth fixing before it becomes a bigger health problem.
- Consistency matters as much as total hours. A regular sleep and wake time supports your circadian rhythm, which affects how restorative your sleep actually is.
- Don’t chase “catch-up” sleep as a strategy. Occasional longer sleep after a bad stretch is normal. Regularly sleeping 9-plus hours as your baseline is worth mentioning to a doctor.
- Feeling exhausted despite 7 to 8 hours is a signal, not something to push through. It can point to sleep apnea, insomnia, restless legs syndrome, or another condition that needs evaluation, not just more hours in bed.
References
- Watson NF, Badr MS, Belenky G, et al. Recommended amount of sleep for a healthy adult: a joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society. J Clin Sleep Med. 2015;11(6):591-592.
- Watson NF, Badr MS, Belenky G, et al. Joint consensus statement of the American Academy of Sleep Medicine and Sleep Research Society on the recommended amount of sleep for a healthy adult: methodology and discussion. J Clin Sleep Med. 2015;11(8):931-952.
- Liu Y, Wheaton AG, Chapman DP, et al. Prevalence of healthy sleep duration among adults — United States, 2014. MMWR Morb Mortal Wkly Rep. 2016;65(6):137-141.
- National Institute on Aging. A good night’s sleep.
- Centers for Disease Control and Prevention. How much sleep do I need?