As time goes by you get used to the sweats especially that one in bed just before you nod off to sleep. Now I just have aircon on (yep big electricity bill) and fling back all the covers. Don't panic, it only lasts about 5 minutes. I am sometimes asleep before it has finished and I wake up freezing under the aircon and pull all the covers back on and off to sleep.
Its no better on Letrozole than it was on Tamoxifen and I got the muther of all sweats in the hospital yesterday in preop registration. I didn't panic even though I was completely wet under my shirt. I just walked over and had a few paper cups of cold water in the room and straight away I started to feel better and cool off.
Just remember it doesn't last long and then you are good for a little while afterwards. :)