What is it with Redditors on this sub constantly refusing to believe that maintaining basic biological functions is crucial to your health just so they can drop the bUt wHaT If iTs aCtUallY jUst a CorrElAtIoN?? and get to feel clever without having any education or understanding in scientific research?

Sleep is very important to health. Your body needs it, it literally can't survive without it for more than a few days. Sleep repairs cellular damage, regenerates your cells and regulates your hormone and neurotransmitter levels, and consolidates your memories. Not getting enough sleep wreak havoc on your whole body in myriad of ways. This isn't even a contested topic anymore, it's not up for a debate, it's a fact. Just because sick people tend to get less sleep doesn't mean it's only a correlation and not getting enough sleep doesn't also ruin your health on its own.