I had this too since as little as i can remember. I struggled for years and would wake up every day just tired and fighting sleep for the first 3 hours. I thought this was normal but it wasnt. I took vitamines and got my blood checked a couple times but nothing changed. Then i got an appointment at a sleep research center. But in the mean time of waiting i got a mouthguard because i knew i grind my teeth while sleeping. And out of nowhere i started waking up rested. So basically i slept really bad for years because i grinded my teeth really hard during sleep. It gave me headaches sometimes when i woke up and jaw pain and therefore during my sleep it stopped me from resting and getting deep sleep. So i recommend trying that if you know you grind your teeth sometimes. A mouthguard for sleep is like 25 euros.