Board Thread:Spoilers!/@comment-25926288-20161115161303/@comment-1916997-20161129050659

DatNuttyKid wrote: All the more reason not to want him under a sleeping curse! :D

Seriously, though, what could possibly be going on here? The Dark One doesn't, possibly can't, sleep. That was a thing covered in 5A.

It's possible Blue is asleep... but her tweet refers to Robert "needing to step up his game" to keep it from being "a snoozer", so the sarcasm/vague teasing implies Rumple would be the one asleep. It's possible Gold does go under a sleeping curse, maybe to try to access the Dream World to talk to his son like Belle does. And I think that a curse would override the fact that The Dark Ones don't sleep. After all, it's not a true sleep, it's a curse.