wacha gotta do is get a bucketload-O-cats. then you sharpen their claws and bait a bunch of squirrel or racoon traps with bud and peanutbutter ...
no, but really, i heard about something callled sleep paralysis where you wakeup and cant move, and sometimes hear and see shit.it can get really intense. That would not, however, explain the clean room.
if all else fails i have heard some wonderfull fhings about chlorine gas