What I hate about that though is that you don't keep any progress you make. Though with how the encounters are guided by RNG, this may be a good thing in some cases.
It's not so much a Hack, but if you start a New Game + you usually get to keep all the wealth of your previous character, so as long as you manage to be financially successful once it gets pretty easy to keep that going.
No hack, but the importance of the well rested buff cannot be overstated. The benefits may be small, but the penalties you avoid from accumulating the fatigue debuff are massive.