You need to rest your body for 5 hours at least. Then if you wake up before your mind starts to rest, do something for a while, then go back to resting, but will enter the REM cycle straight away, other than going to sleep, and eventually going through REM without being able to do anything.

Go to bed. Wake up after 5 to 6 hours. Stimulate your brain in some way, then go back to sleep. Hopefully you will be awake in your conscious mind enough to be awake in your subconscious, ie, your dream state.