i get this whenever i sleep on my back?! some people get it in certain positions, u also get it if ur really really tired and u lay down & fall asleep too quickly (which is prob why ur gettin it, nackerd from the op!) like ur body falls asleep but ur mind is workin overtime! so feels like ur awake but paralysed..
i was dreadin that part of after the op, luckily i only had it once.. i was tryin to nap on the sofa an thought i heard my mum upstairs i thought oh she must be home from work early..heard footsteps comin down the stairs n then a dark figure came in n was getin closer makin this horrible noise! i couldnt move or scream. then i woke up from it lol realised noone was even home!! its so freaky! x