Growth hormone release is circadian regulated. That means the clock is expecting you to sleep at that time. And if you sleep at thattime, then you'll get the reward. It's almost like if you're on time, you'll get this reward. If you're not on time, then the reward will be less and it might not happen. So even if you get the same duration of sleep, but I'm really short changing your start changing many things because there was a time for you to get the benefitIf you went to bed at the same time, the benefit will be reduced. But these are not easy experiments to do, even in mice.