I got bullied pretty bad at school and I also never did my homework, so the teachers would shame/embarrass me for not doing the work. So I was always just worried about how miserable the next day would be. Then as an adult, my ex-wife tried to kill her self twice. Both times were while I asleep and had to wake up and suddenly find her in unconscious and unresponsive in a puddle of blood. Sleeping is surprisingly very stressful for me.