Dreams
A good tip I learned is to keep a notepad next to your bed. (Along with a flashlight of course!) This is a good tip because you can keep a dream log of all your dreams. Or, you know, like as a notepad for notes of things you don't want to forget the next day.
I have several scraps of papers around. On these papers are awesome stories. All occurring from my dreams. We dream every night and sometimes we remember our dreams. The ones I usually like remembering are the movie plot ones. Like ones that made a great story or had a great plot twist etc.
I have had several dreams where I have an awesome dream and write it down (in my dream). I hate that because sometimes I'll forget that I hadn't really written anything down! Then it just seems redundant to write my dream again. Arg, what a hassle.