Five to six hours of sleep may be adequate if one feels good throughout the day with sufficient mental and physical energy and focus.

“So if you're not falling asleep during the day and you feel reasonably good throughout the day, maybe you only need a brief 10-minute to 30-minute nap in the afternoon. Some people nap. Some people don't like to nap. Doesn't matter. But if you feel pretty good throughout the day and you have enough mental and physical energy and focus to complete the activities that you need to complete, then I wouldn't worry so much about five to six hours, and I wouldn't obsess over these kind of scary things that we hear. Oh, if we're not getting seven to eight hours, that we get dementia, et cetera, because that's not necessarily the case. Everyone has different sleep needs.”