I'm often awake for 2-3 hours in the small hours. I usually go to the spare room so I can read - or listen to the radio - without disturbing Dh. Can use Kindle without disturbing him, but not if I have a good book on the go. Often go down and make a cup of decaf tea, too.
If I feel v tired in the day, then if I can, I have no problem with a siesta - usually lie on the sofa with a book and soon nod off. Maybe it doesn't help with sleeping at night, but if I feel the need, I don't care. Since retiring I don't usually have anything to get up early for, though having said that I do usually wake quite early regardless.