Here’s a memory hack I discovered a couple years ago. Whenever you think of something that you’ll need to remember, take a moment to visualize yourself in that future situation, doing or remembering that thing at that time. For example, if it’s a rainy day and you’re driving with your headlights on, picture yourself arriving at your destination and turning them off. If there’s something you want to take into the office tomorrow, picture yourself leaving in the morning with that specific item in hand.
This method works really well for me–I can’t tell you how many times I’ve been on the verge of blissfully forgetting something when I find myself in the situation that I previously visualized and the memory just sort of drops into my mind right when I need it.
I wouldn’t recommend this as a substitute for pen and paper, but if something important comes to you while you’re on the go and you’re afraid you’ll otherwise forget, give it a try.