I hear this number flung about in any study involving how much sleep a person needs.
Then I've heard that numerous well-known historical figures have gotten by on a lot less. Eintein? Five hours.
Me? Hmmm. I never really kept track. I just sleep when I feel tired. My current job means I have to be up at 5.30am every week day morning. I can't remember the last time I went to bed before midnight. So for the past two weeks I've kept track of when I went to sleep. This is a fairly average two week period - indicative of the last two and a half years at least.
I averaged 2.5 hours of sleep a night. Now I thought maybe I was making up the difference at weekends. The longest sleep I had over those two weekends was 5 hours. Now every day at work, I functioned to the best of my ability. I was sharp, I felt good, I did well. At meetings, I was on the ball. Basically, I functioned just fine.
I should add - I like coffee, but during the week, I probably drink a cup a day, max. Weekends, maybe two or three cups over the course of a lazy morning. I.e., not that much and certainly not enough for me to rely on keeping me awake.
So. I'm worried I might keel over and die at random one day.

So how much do you sleep?