A friend of mine dreamed something and he wants to dream it again cause that something was gorgeous 
. May I add that he is a natural. So, any way of having a specific dream?
Moved from General Lucidness. 
Fill your brain up with thoughts about the dream, write about it, draw it… things like that. then repeat to yourself i will visit this dream again describe it. things like that, hope i helped
Or he could just get lucid, control the dream and get back 
Something that works for me is running through the dream over and over as I go to bed. It keeps my mind thinking about it so it’s more likely to happen when I start dreaming.