Did you hear the creeper??
If you were sound asleep in bed at night, do you think you'd know if someone sneaked into your room? Even if they made no noise, do you think you'd realize they were there?
I'm asking because I watched a show recently where a cat burglar was sneaking into houses/bedrooms where people were sleeping, to steal small things. The victims never woke up, and didn't know until the next day when they noticed something was missing.
I like to think I'd know - that I'd realize that someone was there, somehow sensing the presence of another person. But maybe not...