This is driving me crazy! Have you ever had an idea that at the time you thought was brilliant, but you didn't write it down and now you have no clue what it was?
As a writer, this happens all the time. I usually have notebooks, post-its, scraps of envelopes or random pieces of papery trash laying around to scribble down these little gifts from the muse. And last night, I was just too tired/lazy to drag myself out of bed and write it down.
Sometimes, if the idea was actually good enough, it'll come back around again and I'll have forgotten that I already thought it up once, thus tricking me into thinking I'm cleverer than I really am. Other times, it's gone into the ether forever. Or, it's off traveling into some other writer's brain who will make millions off of it. Oh well.
An example of late night (usually while I'm trying to fall asleep) ideas:
Red Eye - a photographer's camera captures the soul of the person in the frame, turning the polaroid into a modern day voodoo doll
Creepy! And it'll probably never be written by me, but I get a little OCD about not jotting these little ideas down. This particular one reminds me of R. L. Stine's Goosebumps book(s) "Say Cheese and Die." He was definitely one of my favorite writers growing up and a big reason I turned out the way I did (for better or worse)
If you're not familiar with his work, go be a kid again and pick up literally any of the Goosebumps series. My favorite is probably "The Werewolf of Fever Swamp" but they're all uniquely awesome!
Or maybe DVDs are more your speed? Good news! Some of his stories-turned-movies are being released later this year!