Since my teens I've battled with periotic bouts of insomnia. I remember going a few weeks at a time when I'd sleep from about 4:30-6, am and pm (without the naps I don't think I could have functioned) and that was it. At BBC it was better some years than others, but I generally slept pretty well, only having two or 3 weeks each year where I'd get less than 4 hrs. a night. Since graduation my sleep has been pretty good, but I still get the occasional few nights where I just can't sleep.
For a long time I thought it was stress or other issues that were keeping me from sleep, but over the years there hasn't been any consistant reason for me not sleeping. Like right now, I'm relaxed, I had a wonderful day (I got most of my house clean, spent time with friends, played with my baby and had time with my husband, what could be better than that?), and there's nothing stressful going on in my life. I'm tired, but I laid in bed for 30 mins and didn't fall asleep.
So now I'm up trying to do something useful for a bit and then I'll try again. Thankfully Ben has baby duty tonight and in the morning so I should be able to sleep in.