Drowsiness

Slept 19 hours. I went in the car and fell asleep without noticing, at home I also lay down and fell asleep for 2 hours. Could this be something serious?

Every day after waking up, an hour or two later, there is a slight drowsiness, what could it be associated with? I sleep 6-7 hours for sure.

This drowsiness is annoying and does not allow work for a long time, I went to a neurologist - until it helped. If I go to bed, I do not fall asleep. Every day I sleep for 6-7 hours, I wake up in most cases without an alarm clock. Most importantly, if I can sleep at lunchtime, this sleepiness di...