Well, initially I want it as a way to circumvent a bizarre issue with my laptop.
It doesn't have any WOL (Wake-On-LAN) features of any kind enabled in the BIOS, yet after hibernating, within a matter of a few random hours, it will spur back to life. The problem is it usually does this overnight and often while in my backpack and when I try to turn it on with the battery the next morning, it's been drained. (duh!)
So, if I could have a prompt with a timeout to ask me if I wanna return to hibernation, then I could have it rehibernate after mysteriously waking up and keep doing so as much as needed. This way at least I'd have some battery left for the next day. (It doesn't unhibernate immediately... it's after a random amount of hours.)
But there's other things I could do with it, too.