What do theys dreams mean ?

im now 13 but when i was 6 i had theys dreams thay where kinda like star trek id go around fighting alians with kool guns and so on ... but its not the same dream over and over its like go sleep dream wake up next night sleep go from where i woke up from if that makes sence but when i was 8 theys dreams stoped and i remember saying in the last one i was when i was 8 i said " i will be gone for a long time " then only last year i had it again and it was so nice beying back with the crew and so on i lucid dream which means i can controll my dreams and im aware of dreaming also is it normal to be dreaming like this and i would love to have the dream tonight any ways of doing that ? am i normal ? x