I am a huge believer in the 15 minute power nap.
The thing is, most of the serious topics have been discussed and beaten to death.
Geez, I'd hate to fly with someone whose "goal is safety". . .Who cares about what the regs say on the subject? The goal is safety. I recommend the IMSAFE checklist. if you're tired, land and sleep or don't fly but do not engage in "long blinks".
On the other hand, a wee bit of safety is O.K. . . I heard tale (obscure SNL reference) long ago, of a primate, DNA quite similiar to mine, that attempted to aileron roll a 172. The smooth ape was young, and had read a book. . .the exercise ended a thousand or so feet lower, on another heading. On a positive note, the shock engendered in the monk a new capacity for abstract thought. . .Better yet, do an aileron roll, that'll wake you up!
(careful not to apply full deflection if you are above Va)