[davnicwil]

So are you sleeping 5.5-6 hours per night? Is this just on work days or all the time? How long can you / have you sustained doing this regularly?

[DailyHN]

Sounds like the Jay Leno gene. Must be nice. I need a solid 8.5 hours otherwise I'm useless.

[Frondo]

I've known a few people who were fine on 4 hours a night. just the way they were built. for me, less than 7 and I simply can't concentrate on anything all day, til about an hour before my next bedtime...

[jkaplowitz]

Scientific evidence matches your anecdotes. There is a very small percentage of people whose genes allow them to only need 4-5 hours of sleep each night. It's somewhere in the low single digit percentages.

For the rest of us, 7-9 hours are required for proper functioning. If we get by on less, we're functioning suboptimally whether we realize it or not.

[40acres]

Mostly on work days (weekdays), throughout the day I have plenty of energy but around 9:30 I start yawning and the exhaustion kicks in. I don't drink coffee or anything to get through the day.