Most adults need at least 7 hours of sleep a night. The CDC breaks it down by age: adults 18 to 60 need 7 or more hours, adults 61 to 64 need 7 to 9 hours, and adults 65 and older need 7 to 8 hours.
That lower limit matters because regular sleep under 7 hours is counted as insufficient sleep, not just a bad night. If someone is consistently short on sleep, the next step is usually to look at the cause, not just to chase a later bedtime.
Sleep needs are a range because people vary, but the big signal is how you function during the day. If you are sleepy, foggy, or relying on caffeine to get through basic tasks, the number is probably too low.
The easiest improvement is usually a boring one: keep a regular bedtime, reduce late caffeine, and make the room dark and cool enough to sleep.
If that does not help, the problem may be sleep quality rather than sleep length, and that is worth checking with a clinician.
This is general information, not professional medical advice. For decisions about your situation, talk to a qualified professional.
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