It’s not unusual for me to be awake in the middle of the night, either from falling asleep with the TV and light on or just from waking up for no reason at all. I will go on FB, Fluther, NY Times, New Yorker, and hopefully after a few hours I get tired enough to fall back asleep.
If I read a book or magazine, that means turning on the light. Computer I can do in the dark because it has its own light.