I think someone said 7-8 hours is a good amount of sleep to get. If not, all kinds of bad stuff is predicted, such as higher blood pressure, not thinking right, not remembering.
I'm lucky if I get 6 hours of sleep. I can't seem to manage to get more. If I go to bed earlier, I don't fall asleep. If I fall asleep on the couch ahead of time, I can't sleep. It seems the best solution is to stay up until I'm good and tired and then I can sleep.
Unfortunately, that's not the recommended allowance. What about you? How much sleep do you get? Do you think you need more?