5 lucid dreams in a row very short

It started like this
First lucid dream it was pitch black and I could hear a sound as if the dream was about to start it didnt and I woke up I went back to sleep happend again then I tried to think okay I need a dream scene concentrate on staying lucid woke up again then I hear the sound again it sounds as if I went underwater and hear the water then bam straight into a dream I was at school running it was wet and I saw a person I thought I would sneak on the person and surprise them or kill them but before I could even get close I woke up and then I had another pitch black dream and woke up then just fell asleep :| Any tips for staying in the dream longer for an Old Lucid Dream