Based on personal experience, I would have agreed with you, right up until last year, when I found myself in the rather terrifying position of being mentally aroused by a huge crash in my house, but unable to wake up all the way for several seconds afterward, during which my sleeping mind refused to reject the "something just blew a hole in the building we're under attack!" hypothesis.

(It was an overfilled bag falling off the wall.)

But absent actual difficulty waking for potential emergencies, sure; hang out in Tel'aran'rhiod until you get bored.