For instance, I read Gwern's page on melatonin probably at least a year ago, but only a few months ago did I actually get around to buying some.
Yes, but did it actually work?
Yes. Anecdotally:
I used it to shift back my sleep schedule from something like 10pm-6am to more like 7pm-4am. I tried this several times unsuccessfully prior to starting on melatonin. I like having an early sleep schedule because it makes it easier to recover sleep debt (sleeping one hour longer is easier than going to sleep an hour earlier). It also allows me to not waste the prime morning hours on school things, which is also good for motivation. Taking melatonin also seems to boost my mood and focus the next day if I used it to sleep long (10 hours, say...
Checklists are powerful, and I don't use them enough. You probably don't, either.
Below are some of my own checklists. Please share your own!
I don't know how to do X.
I don't understand X.
I feel mentally exhausted but can't afford to sleep right now.
I don't want to get out of bed, but I should.
I'm procrastinating on task X.
I'm about to send an email / post a comment of some significance.
(I don't do these ones nearly enough! D'oh!)
I feel sad about not doing a better job at X.
I'm about to make a decision of some significance.
I could go on, but... what are yours? (Now is also a good opportunity to make some checklists for yourself, based on what you think tends to work for you.)