Kind of like sleep walking but not really?

Ok, so this is the third time this has happened in under a year. What I do, is I wake up in the middle of the night and look at the clock (my cell phone is my clock and alarm) and for some reason, no matter what time it actually is, I think I'm late for work and have to get up. So I do, I go to the bathroom and turn on the shower. Two of the times I have come to my senses and realized it was not time for me to get up and didn't get in, but one time I actually got in the shower. It is kind of like sleep walking, because I am not thinking logically and am always really confused and rushing to get ready. I also tend to see the time as being some weird, nonexistent time, like 1:90am the other night (I actually get up at 6am but I think I have to be up at 1:90am for some reason). I remember all of it though, very clearly. I know they arn't dreams because my room mates have heard me getting up and turning on the shower late at night. This has always happened on normal nights, I was never drinking or on any drugs and I'm not on any medication. Has this ever happened to anyone else? Does anyone know what this may be or what is causing it? Haha it's not a big deal, it just kind of ruins my sleep, especially when I actually do get in the shower and have to sit around drying my hair at midnight :P