Ok, as per usual the skeptic alarms are going off. lol.
I will elaborate on the conditions of the night in question.
1. Room is pitch black. thick drapes on windows.
2. Ceilings are 15 foot. a good distance from my sleeping head.
3. Scorpion was curled up into a scrunched up postition, as in
not moving at all.
I could absolutely not see this thing up there. nor did I hear it since it was not moving at all. nor could I smell it. As far as I know scorpions dont smell. It was quite small about 1 inch and tan. In fact at first I thought it was a small insect.
So I can not rule out sound but between the air conditioner and ceiling fan going I would not hear it.
I am ruling out smell, cuz I have killed many scorpions, they do not emit a oder.
I am ruling out sight cuz it is pitch black in my room at night and this thing is 15 feet in the air and only about a inch long.
I believe my spider senses were tingling..