Missing Out on Deep Sleep Causes Alzheimer's Plaques to Build Up

Someone needs to write how much deep sleep you need per night!

I'm a light sleeper and with recent chronic pancreatitis, I have trouble sleeping...

Articles like this only dial up anxiety and make things worse!

For example. My hear fit says I get 3h30m of 'motionless'.. is that enough deep sleep? Apparently, not very clear since trackers aren't really accurate enough