Dream interpretation is very individual. Those stupid guide books of dream interepretation mean zilch. If I have a dream about throwing puppies out of a window it will probably mean something totally different than if YOU have a similar dream. That being said, bear in mind there are there basic types of dreams:
1. Fantasy/relaxation: Doesn't mean anything, it's just your subconscious taking a little vacation and having fun; if you're lucky you get hot sex, maybe go out with a celebrity or a good laugh out of it (I once had the funniest dream about visiting Japan and they were holding a Godzilla drill, I woke up laughing).
2. Illustrative/educational: If something in your life is bothering you or making you miserable this is the way your subconscious gets a message through to you. Frequently they involve puns or plays on words. You might have to sit and think about different ways words can be interpreted.
3. Prophetic: These stick with you, they are different from the other types, there is unusually powerful emotional content attached to them.
So it sounds like what you had was a dream of the #1 variety and you needed to seriously relax. You spent all night partying with Kid Rock, he has a reputation as being a party hardy kind of guy who likes to have a lot of fun; sound like you needed to seriously relax and let your hair down a little so you can better apply yourself to some things ... I do wonder if stress hasn't been giving you some trouble with your workouts since steroids got mentioned towards the end of the dream ...