Not at all surprising; there's evidence that cannabis use suppresses REM sleep. Anecdotally, people who suddenly stop taking it after long periods of use tend to report unusually vivid dreams.

That's exactly what's happening with my girlfriend right now. She gave up cannabis after years of heavy smoking, and it seems like every morning she wakes up telling me about the intense, vivid dreams she had.

That said, while the quitting process has been quite difficult for her (irritability's through the roof- almost as bad as when I've tried to quit smoking cigarettes), she says she started feeling "better" almost immediately. Probably the best part (for both of us, haha) is that her natural appetite is coming back- and in fact, she's reporting that she's developing a taste for a lot of foods she previously didn't like because the flavor was too intense or the texture was too unusual. The only real explanation we can figure out is that the cannabis intensified culinary experiences to the point where she couldn't handle it, and so she just ended up avoiding a lot of types of food.

The brain is an interesting organ.