I really feel for those who suffer ( I shouldn't say but I can sleep on a knife edge, anytime, anywhere 
My Dh on the other hand never feels he sleeps well enough.
I do have the odd night where sleep is elusive and I do just give up, I either get up , get a snack and a drink and come back to bed to read, or in the summer when the weather is warm ( hopefully) I might get up do some crafting , read or just watch the night out of the window.
I think not sleeping can be a repeating cycle. You cant sleep , so you worry about not sleeping and then you cant sleep because you're worrying. I take afternoon naps and find them the perfect pick me up, then if that means I go to bed later I do.
I've given up living to the clock and now ( apart from appointments) I live to my own body clock.