asleep or awake? unsure

i used to have strange things happening to me when i was asleep/awake? sounds odd, but as i was waking up, i felt as if i was paralysed i couldnt call out or move,it felt as if a weight was on my chest,at the time i put it down to me using lots of amphetamines,but it continued even after a few years of not doing them, the last time this happened to me was last year,its not often, i have always been curious as to what causes it?

I think you should got to see a doktor to check it up, maybe its something else.