Anything with paper in it is fine. haha, since you can have a lucid dream during the night, and not remember it. So if you wake up and tell yourself, "I'll remember this in the morning" you usually won't. Some times I get lazy and do that, but most of the time, in the darkness I just write a little fragment of the dream to remind me of it when I wake up, then put the full details in. Most lucid dreams, to me, stay stuck in my head for the day at least. But better safe than sorry. Right?