: Why is it recommended to have 8 hours of sleep when sleep cycles happen every 90 minutes, wouldn’t waking up at 8 hours be in the middle of your cycle?

Question

I’ve learnt a little about sleep cycles and remember that every 90 minutes is when we move through the 5 stages of sleep, but I’ve also heard it’s recommended to have 8 hours of sleep. Wouldn’t that make you feel drowsy if you’re interrupting the sleep cycle when you wake up after 8 hours?

In: Other

Answer 1

Don’t know if it was commented before, but I think I saw something on the internet before about certain fitness braces who can somehow sense in which stage of the sleep cycle you are and wake you up when it’s the easiest to be woken up.

I found this app, looks interesting!

https://www.sleepcycle.com/how-sleep-cycle-works/

You know that when you wake up at 5 am and feel ready to stand up even though you could sleep till 6.30? And if you do go back to sleep you feel like shit afterwards? I guess there’s something to it. Had that recently when I couldn’t find my phone to put my alarm on and I woke up by myself from subconsciously knowing I’d lose my job lol.