Or something like that. I think I may have some proof. After a few months when I hardly slept due to stress and hay fever and heat, I had got as fat a as a pudding. Couldn't do up my jeans - only my loosest ones fitted at all. Last three nights I slept like a log and lo! I can get my jeans on again.
Is that just coincidence? Water loss? Or is them some truth in it?