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.
see a doctor. you're not getting enough sleep and that is very dangerous. I get 9 hours of sleep every night and I'm as healthy as a horse.
It's not necessarily true that
everyone needs eight hours of sleep. There is a small group of individuals who are classified as "http://www.cnn.com/2011/HEALTH/03/12/short.sleepers.daylight/index.html"; these people have a genetic mutation that permits them to function normally on much less sleep than is normal. I worked with a man for six years who was a short sleeper. For the first few years I thought he was lying when he said he slept an average of three hours a night, either that or he was a drug addict. He performed his fast-paced, physically-demanding job all day without diffculty despite sleeping less than half the recommended hours. It was only after coming across that study that I realized he was being honest.
There are several theories on how much sleep is healthy, as well as how best to divide your sleep time. The most recent research points to a natural sleep pattern of approximately eight hours divided into two four hour periods with one to two hours in between. Whether what is healthy or normal is even obtainable with today's societal and career expectations is a matter of considerable debate. Regardless, what is best for each individual will vary considerably. Only you in coordination with medical advice can determine exactly what is right for you.