I've never had a problem sleeping. I'm one of those out like a light as soon as my head hits the pillow types. (Which I actually credit my parents for, who insisted on regular bedtimes and a good bedtime routine and which I've always maintained).
However, recently I'm waking about 4am and not being able to get back to sleep. It's not that I've had enough sleep, I'm shattered.
Is there any "help"? All the usual advice is around things that help you go to sleep in the first place, not things you can do at 4am