I'll add some final things, just like Checker said you should stay in bed and keep your eyes closed when waking up. This will trick your brain into thinking you're going back to sleep and all of a sudden your dream memory will be much easier to access. I'd also like to remind you that whenever you're writing down your dreams make sure you do it by writing down keywords only and not the entire dream. You can fill in the blanks later.

Good luck!