Sometimes a great evil needs a Tailor-Made Prison. Some need to be trapped in a can, maybe a person-shaped one, maybe six, or be stuck fighting another entity in some pocket dimension. And some... just need a good night's rest.

The monster is restrained by its own inactivity, fallen into a hibernation, deep sleep, or even a coma. This can be magically enforced or brought about by severe injury, but in some cases it's self inflicted. In any case, the threat is contained so long as they remain asleep. The circumstances for their waking can vary from