This is not realy a "techie" question so thought I'd post it here.
I use a pc at work for several hours a day - mainly email and word processing. I also use my home pc in the evenings and at weekends for various things - this site quite a bit lately. I try to quit in the evenings about an hour and a half before I go to bed - bed at about 12.15.a.m. I don't have too much trouble getting off to sleep, but I wake up early, sometimes 5 or 6 a.m. I do feel I need more sleep as I feel tired in the day. This has only started happening in the last couple of years as my pc usage has increased. Does anyone else experience this or is just a sign of old age?