My wonderful dream...?

My dream last night was about Sidney Crosby. He was in my backyard and I was home alone. My 2 roomates were gone and I was all over Sidney because he is so freakin' hot. Anyways we started making out, taking our clothes off, and I was touching him everywhere. :) I won't give all the details but It ended really good!!! I woke up refreshed, happy, alert, etc. I feel so nice today. Why do my dreams effect my mood?