What would possibly be causing me to suddenly start dreaming?

For years and years – really as long as I can remember – I would only have a dream once a month or so (that I could remember in the morning). The only dreams I could remember were like horror movies. Decapitated heads were a recurring theme for a few months… <<shudder>>

In the last few months, though, I’ve suddenly began having regular dreams, at least 4 nights a week. And they aren’t horror movies any more! They’re just generally zany, a compilation of elements of my day. Yay!

So, as far as you know, what could possibly have caused this?

Do you know of a way to keep it this way, so I don’t have to go back to the monthly horror movies? The way I worded that makes me wonder: Could it have something to do with my menstrual cycle? (I’m a 16-year-old girl, btw)

Have you heard of other people having changes like this? Did you? What were the theories for them?