I sleep for hours and wake up severely tired. I have no interruptions throughout the night. I get my thyroid tested every three months and it’s always normal. Last night I slept for 12 hours and I woke up extremely tired and I wanted to go back to sleep. Is there a possible reason behind this? I am on meds and I only take them at night, about 2 hours before I go to bed. I can last throughout the day, but it’s difficult.