was this a dream?

hi this happened to me over a year agoon several occasions and i'm not sure if it was a dream or real. i 'sleep in' at work and this hasonly ever happened to me when i have slept over at one particular workplace(not sure if that information counts for anything.) I'd feel like iwas awake and aware and that iwas experiencing some sort of fit, my body rigid and jerking and i felt i had no control over my movements, i felti knew what was happening and tell myself in my headnot to panic and itwould pass if i didn't fight it, it was only a fit etc(i do not and never have suffered from epilepsy or similar) On one occasion i have actually fallen out of bed (or dreamt i did!) afterwards i'd be so worn out i would fall asleep.In the morning id feel exhausted and unsure if it was a dream or real.... not had one of these for a while now butif i remember right i was pretty stressed at the time. Does anyone know what this was??