I've never tried to have lucid dreams, or even tried to control them. It just happens. It always freaked me out, because I thought that since I'm dreaming I shouldn't be able to control them.
Anyway it started happening a couple years ago, and it's to the point now where every dream I have (that I can remember anyway) I know I'm dreaming in it, and I control it...I don't intend for it to happen. Sometimes it happens (and I have no idea what this would be) and it's as if it's a normal day. Except I know I'm dreaming, but it's the next day and I go through the day as I normally would. Then it'll turn out that when I do wake up I end up living out that day. But since I controlled the first dream day and made all the decisions, it doesn't seem like it's predicting the future...'cause It's just me making the same decisions (I guess the circumstances are being predicted?). Either way it kinda scares me and I'd much rather have it stop.

Anybody know why it happens?

(Sorry if this didn't make much sense.