I've been there, you've been there, everybody has been there. After a long week of getting up early for work and not getting enough sleep, you get to sleep in at the weekend and catch up. It's great isn't it? Well it turns out that's actually quite bad for you.
You may have noticed that when you oversleep you still feel like hell, your head hurts, you feel a bit sick, and you're still bloody tired. Why are you still tired after 10 hours sleep? Scientists call it sleep drunkenness, because of how similar it is to a hangover, and it's caused by confusion in your body's daily cycle.
Your body's cycle is set by something called the circadian pacemaker, which is located in the hypothalamus, the part of the brain that regulates hunger, thirst, and sweat. When triggered by light from your eyes the pacemaker decides it's morning and send the signal to the rest of your body. So the brain is telling your body that it's time to get up, but your body is still lying in bed which induces fatigue when you actually get your lazy self out of bed.
So why is this bad for you? Turns out oversleeping on a regular basis has been linked to diabetes, obesity, and early death. But it's a lesser of two evils since undersleeping puts you at even more risk. Well shit, we just can't win can we? [Wired UK]