Is it possible to gain control of your dreams every night If so how?

I have had dreams where I was able to control what was happening in them, example I had a dream that there was all these vampires in the air port an they were coming to strait at other humans an myself tryin to kill us, an I realized I was in a dream some how an slowed time down for them enabling me kill them (samauri X) style which was cool, I have also been able to control other dreams basicly I was wondering how can this happen all or most of the time?