I've taken to writing down words and ideas as they occur to me, as there's nothing worse than having them come flapping in like raggedy winged vultures long after you've finished a story, squawking 'remember me?'
I haven't found a way round the phenomenon of words coming to me in the middle of slumbering. I did some editing before going to bed last night, after noticing that I'd used the word 'cover' rather too many times in my WIP. I altered a few of them, assisted by a thesaurus, but others resisted my efforts to find replacements. Turning over in my sleep in the early hours, the word 'concealment' flashed into my noddle as being perfect for a particular sentence—thanks very much brain, I was having a nice dream I wanted to return to.
I don't think that I'll use a notebook by the bed, as my one attempt at recording dreams in a journal during the night, to use as inspiration for short stories, produced pages of scrawled writing that looked like a seismograph chart for an earthquake!
I've also tried remembering things using the
loci system that memory experts have used for centuries. This is also called the 'memory or mind palace' and, briefly, involves using a mental map of a house known to you to place objects in that you need to recall later, making connections that are mnemonic. I like this idea, but only get so far with it, as my mind wanders looking out of the windows and thinking 'hmm, the grass needs cutting', losing the connections I've established. Instead, I rely on one memory drawer, a small wooden one for holding pens in my teen years writing bureau where I did homework. If I need to store something for later use, I pop it in this drawer where it stays until I have a rummage.