Can only go so far!!

[tilarkin]

Hi There, i sometimes meditate before i go to sleep, i relax my hole body & try to empty my mind, i get to a stage where im in r.e.m. & my hole body is buzzing, its extreamly intence & after a while i start to feel dizzy & have to stop, why does this happen? also lately ive been able to bring that feeling of on at will, any time i want, & when i do ive noticed my pupils dilating very large, can this have a bad effect as ive started feeling what i can only discribe as electric shocks running throug my brain, when i wake you in the middle of a dream or early in the morning when i get up??