I'd be worried about "too tired to go to bed" syndrome, but that might work for me if I avoided doing things where the syndrome would apply.
I've had that on occasion with modafinil, but melatonin doesn't seem to suffer from that; which makes sense, given its role in sleep - it can't make you need to sleep and not make you need to sleep, if you follow me. (The real danger is the dual to your syndrome: 'too tired to wake up', when you overdose heavily and feel like shite in the morning.)
People have been encouraging me to share my anti-akrasia tricks, but it feels inappropriate to dedicate a top-level post solely to unproven techniques that work for some person and may not work for others, so:
Go ahead and share your anti-akrasia tricks!
Let's make it an open thread where we just share what works and what doesn't, without worrying (yet) about having to explain tricks with deep theories, or designing proper experiments to verify them. However, if you happen to have a theory or a proposed experiment in mind, please share.
Bragging is fine, but please share the failures of your techniques as well – they are just as valuable, if not more.
Note to readers – before you read the comments and try the tricks, keep in mind that the techniques below are not yet
provensupported or explained by proper experiments, and are not yet backed by theory. They may work for their authors, but are not guaranteed to work for you, so try them at your own risk. It would be even better to read the following posts before rushing to try the tricks: