Been having the same problem myself. It's been like this for years but I basically just got used to it a few years ago. But I suppose I had forgotten it cause my psychologist seemed more concerned than me about it.

He recommended a sleep study myself but insurance expects me to pay the first $2500 before they help. I am used to it but still annoying - sleeping 8 hours and I wake up tired and tired all day and even if I try to get extra sleep or sleep less, always tired. Annoying.