The only night when I get a good nights sleep, is when I take one of my knock out pills. But I'm only allowed a max of seven a month, so I try to ration myself.
I only take one after I've gone through about seven nights without getting much sleep, usually due to nightmares, or pain in my back, which means I can't get to lay in one position for long, before the pain forces me to move, again.
I tend to get really short tempered and narked, as well as depressed, once I've gone through a few bad nights, without much sleep.