why is being overtired a thing? why isn’t the body grateful for the extra sleep?


why is being overtired a thing? why isn’t the body grateful for the extra sleep?

In: Biology

Fwiw, being overtired means [not having enough sleep](https://www.healthline.com/health/overtired) . It doesn’t mean that you’ve had extra sleep.



Sorry to be clear I mean when you’ve slept too long, used the wrong word for it

I think there is a confound here which is that, hypersomnia is strongly associated with depression which also is associated with lethargy.

If you are referring to sleeping too much, you can wake from sleeping too long with a kind of “sleep hangover” (headache, lethargy, dehydration, hunger) but you can also wake not feeling well if you interrupt a sleep cycle (sleep less than an increment of about 1.5 hours) as your body is not ready to wake. Some points in a sleep cycle are like coming up for “air” while sleeping. You get closer to wakefulness and then sink away from it again. Could either of these be what you are talking about. source: I’m a person who sleeps and spends way too much time researching better ways to do it.

Your tiredness has 3 elements.

Your body produces a chemical when you are awake. It determines by how much of that chemical how long you have been awake and if you should be tired. Coffee prevents you from detecting the chemical.

Your body measures light and makes you more awake when it is light and more tired when it is dark. So you naturally sleep at night.

Sleep is a cycle, not all sleep is the same. The ease with which you wake up and how you feel when you wake up depends on where you are in the cycle.

It takes about 15 minutes before you get into deep sleep and you come out of deep sleep after about 90 minutes.

So if you wake up in the middle of a cycle you wake up groggy even if you don’t need more sleep.