Dreams are weird

This isn't for anything in particular but why is it in dreams things don't work right.  I think I need to do some Dream Analysis o_O.

Example 1: I am by no means a fast runner.  I am fast enough, I do about a 12.5 min mile (need to train) but in instances of needing a burst of speed I can take off at a very very quick sprint.  It's short lived but I know I can do it.  Yet anytime I need to "run for my life" in dreams, it's like running through quicksand.  I have no idea what I was dreaming about the other night but I vividly remember needing to run and just not being able to.  Like I kept trying but I was barely getting anywhere. 

Example 2: Throwing a punch.  Okay again, not superwoman or anything but I know I can throw a punch. I unfortunately have had to punch a tw@t waffle for being a tw@t waffle and I split his eyebrow knocking him on his butt and did NOT break my hand.  But I know I've had many many dreams where I try to punch/kick/slap/claw and it's like they just don't land with any force.  

Example 3: The lights don't work. I can't tell you how many times in a dream I walk into a dark room and flip the light switch...and it doesn't work.  I immediately get that heart pounding sinking feeling of pure terror.  I don't get it.  I am generally not scared of the dark.  But in these dreams, it's almost like the dark is alive and won't let the light on.  I know I know WEIRDO. 

I'm sure there are other weirdo things but these are the ones that have happened recently and it just makes me wonder...why.  I'm assuming my subconscious is trying to tell me something.