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.
Earmuffs have helped me a lot for productive time. The silence lets me focus more on what I'm trying to work on. Compared to my noice cancelling headphones (qc 35 II) I can't play music even if I want to to so less likelihood of distraction. On occasion though, if they aren't enough by themselves I'll put earbuds inside the earmuffs with low wind noise. I can hear pretty much nothing external after that.
They also help me sleep on planes since they block out a fair portion of the noise.
This is the one I use: https://www.amazon.in/3M-Peltor-X5A-Over-Earmuffs/dp/B00CPCHBCQ
It looks ridiculous when you wear it. Really ridiculous, I won't lie.
Two related life hacks:
1. Poundland earplugs are surprisingly good.
2. Slot glasses in over the top of earmuffs. I don't wear contact lenses due to dust allergies, and, even if I buy the thinnest frames, glasses under earmuffs still reduce sound attenuation. (Disclaimer: wearing glasses over earmuffs causes some visual distortion.)