Sometimes, people have life problems that can be entirely solved by doing one thing. (doing X made my life 0.1% better, PERMANENTLY!) These are not things like "This TAP made me exercise more frequently", but rather like "moving my scale into my doorway made me weigh myself more, causing me to exercise more frequently" - a one-shot solution that makes a reasonable amount of progress in solving a problem.
I've found that I've had a couple of life problems that I couldn't solve because I didn't know what the solution was, not because it was hard to solve - once I thought of the solution, implementation was not that difficult. I'm looking to collect various one-shot solutions to problems to expand my solution space, as well as potentially find solutions to problems that I didn't realize I had.
Please only put one problem-solution pair per answer.
Problem: I struggle with sleep. Both getting to sleep and staying asleep.
Solution: Custom gel earplugs, and soft fleece eyemask.
Improvement: %%.
Comment: I'm sensitive to light and sound, so the slightest noises and early morning light will wake me up. I didn't realise this may be the cause of the problem until three years ago; people told me it was because I was depressed, but it was the other way around. I tried a bunch of solutions but they were all irritating, and the plugs icky or wasteful. So I went to my local opticians for my earplugs (best £100 life spend.) And for the mask I found a material that didn't itch on my skin with soft pressure, and made it into a headband. I used to be a sleepless mess until my twenties. This was a big change.