When done right, the shivers and black sparklies encroach, and you feel like you are nearing a precipice in the darkness. EEWWWWWW!
I used to do something kinda like this all the time when I was younger...I mean not the whole "I'm an alien" thing, but I would contemplate existence and awareness and all that and "do I know I'm really me?" stuff. Weirdness.