Age You Can't Hack the System

The average person needs five of these sleep cycles to function normally. And they each take about 90 minutes. So that is, if you're doe in the math, seven and a half hours of sleep just to function normal. When you can win your sleep deprived and you can get an extra sleep cycle, wake up kind of like you've been this last week, David says. It's amazing how good things can be when you have built in this system.