Why can your body have a “sleep debt” but not a “sleep surplus”?

Question

Why does my 15 hours of sleep on the weekend not counteract the 4 hours I get on a weeknight?

In: Biology

Answer 1

Its like your laptop – once you use is for a while you need to charge it up and if it falls to 0 you need to charge it before it works again but if you leave it overnight the max is only 100%