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.
Getting into bed by 6pm and waking up at 3am (small win), going through my moring routine: 20 pushup 10 knee ups to warm/ wake up (small win), make bed (small win), at least 30 min walk outside (small win) all these thing set my day up to be productive I the last 5 months I've accomplished many Sunrise hikes, over 21 friends made, read many books i'd been meaning to get to, started carrying around a journal and writing everything down. Some of the moments of the last 5 months have been the best of my life, I have been feeling great. I have accomplish more towards my life goals in 5 months than I have in 3 years.
Sources:
The Miracle Morning
The Power of Habit
I suspect the best sleep schedule is highly individual.