Vivid Daydreams?? what's up with this?

Lately, I've been having day-dreams about a guy I like, but I haven't seen him in person in about three years. I noticed that I haven't been dreaming at night, but moreso during the day about him. The dreams are usually the same or similar. It always starts out at a club, we're dancing together, then things get heated up. He starts tracing his lips down my neck to my collar bone, always stopping short of the collar of my shirt(which is a low V-cut). Then we leave the club and we go back to his place. Things progress from what went on in the club, but it doesn't go as far as sex. That is where it usually ends.

When I start day-dreaming about him, I actually don't remember how I got to the place I was at. It's almost like I lose myself. I"m confused and kind of scared since it does happen on ocassion when I'm driving. I like him, and we've talked over IM sessions, things have gotten erotic in our IM sessions, but we have yet to actually meet eachother for the first time in three years. Any ideas on what might be going on here???