I was trying to fall asleep but just felt strange. I got exhausted to the point I couldn’t keep my eyes open and fell asleep, for the next two hours I’d wake up, feel awful feel scared etc and then due to being so exhausted something pill me to fall back asleep. Like right now I feel so tired I can fall asleep writing this but then I wake up again and the cycle repeats . 

The exhaustion feels awful because I just start dozing off without any warning and abruptly woken up . Anyone experience this ?