Can't sleep!

I am 33w and my sleep quality has taken a nose dive in the last 10 days or so. I'm so sleepy I can barely keep my eyes open during the day, but at night I just can't stay asleep! I can fall asleep pretty easily but wake up every hour or so to change position, go to the bathroom, and/or because I'm having a hot flash and wake up in a pool of sweat (even with the AC on full blast). I have tried tons of pillow/support configurations, I've tried a full body pillow, and I've even made my husband sleep on the pullout couch a few times so that I can flop around to my heart's content, but nothing seems to make a difference. Suggestions??