I would really love to have the Sleep ability the protagonist from The Long Dark has. Unless they're fully awake, as long as they're a little tired they can sl

I would really love to have the Sleep ability the protagonist from The Long Dark has. Unless they're fully awake, as long as they're a little tired they can sleep until fully rested. I've long assumed it's probably due to people who'd do bad things with any sort of useful, "I'd like to go to sleep in the next 15 min, oh and no side effects if the fire alarm goes off in 30 min" kinds of drugs that they aren't a common OTC item.