haha I had one of those mothers who would never let you get into bed with it on! I think you shoudl always turn it off before you get in. Just incase you fall asleep. I haven't heard whether it is bad for bub or not but I wouldn't take a chance! Ask your OB. I would be more concerned about hydration levels. I think it's really important to stay properly hydrated when pg and even if it doesn't feel too warm it does dehydrate you.