I take alot of vits/herbs sometimes at 8:00 PM or later. I sleep on my stomach and wrap the blankets underneath as well as above. The room is always cool. I wake up in the middle of the noght and my chest area is wet with sweat. I am 57 and average weight and active. Any ideas what can cause this. Also once I wake in the middle of the night I cannot fall back to sleep as my mind has a million thoughts runnning through it.