I can get off to sleep really quickly, always have been able to. It's this waking up in the middle of the night and then not being able to get back to sleep again that's pissing me off. Incidentally, I know that waking at 5h30 doesn't in itself count as insomnia. I could have done without it, though. Thinking back, I think I was probably too excited about getting down to my first home match of the season (well worth it, that was pure sex for about half an hour yesterday ;-) )
I usually lie around for about half an hour getting progressively more bored, and dwelling on problems (real or imaginary, difficult to draw the line at night, for some reason). Then I get up, brew myself a cup of tea, and read for about an hour or so. If it's still as early as 4h30 or fiveish, I can usually get off to sleep again. So it's not a serious problem. But for decades I used to sleep like a baby, from 11 to 7. Those were my times. That's gone, forever, I think.