it depends wahts on your mind, your dreams are greatly influenced by recent and important experiances.
also from old but more so from recent.
the other greatest factor is your current emotional state and ur unconscious mind.
so if you are happy with no worries you arnt gonna get nightmares, unless you haev unresolved issues from childhood or whatever.
my dream was pretty cool
was at the swimming baths and i was just floating at the deep end watching everyone, it was well crazy, the were hundreds off ppl i didnt kno but they were all swimming about havin fun, splashing each other n stuff
this swimming pool was huge, hundreds of ppl lol
then i looked onto the balcony and sic was trying to convince sum ppl to belly flop off the edge ino the pool, but they were like duck that, so he put out sum matches out on his tongue and dived over the balcony lol
cap was up top but id didnt see him i just knew it was him cos he shouted "Chamone mutha fucker!" just as sic hit the water lol
then i turned round in the water and i saw my gf and i was like "heeeey come on in!" so she did a flip and landed on my head and started dunking me lol
so i went all limp and she jumped out an was like "ahhh lee!!" so i jumped out and pushed her in

was kinda wierd cos i jumped off the water as if it was solid ground lol
then i was woken up by the alarm on my mobile >.<