do you leave their door open at night?

Lately I've been waiting until my kids are asleep, and then opening their doors so that they can get some cool air from the a/c. Otherwise the rooms get pretty hot, and the kids are likely to wake up sweating!

Problem is that when the doors are open, the kids are much more likely to wake up in the middle of the night and then wander over to where I'm sleeping. Not sure how to fix that one, other than with a fan.

If your LO's bedroom doesn't have air conditioning, how do you keep them cool at night?