The only time that I am NOT wearing a watch is in the shower, and that's only because the watch is not waterproof.
I wear it all the time, even to bed, because when I wake up in the middle of the night I need to know what time it is (it has glowing numbers/hands)--and we don't currently have an alarm clock with LED numbers that both ktsp and I can see. If we did, I *might* take off my watch at night, but we'll see when it happens. I like being able to know what time it is, anytime... even though I am often late for everything.
This is also the first watch of mine that I have really loved and wanted to wear all the time... my dad let me pick it out as a master's degree graduation present in 2005, and it was the first time that I got to pick my own watch instead of someone else giving me something I didn't like. There are two times that I have not worn it since then: when I went to Zambia and lived in the bush for 2 months, because I didn't want to have anything valuable on me at the time; and when I was working at the fish factory in Iceland for 3 months, where we were not allowed to wear jewelry in case it got caught in the machinery or fell off into the fish.