I'd be thrilled to get a text at any hour with a notification that Glitch testing is in session until things become more regular. I don't check my email enough for it to be useful; I might as well check the game itself before I check my email. Alas, texting.
Would I wake up at night to play? Yes. Would others? Depends. If we were to get technical... a system could be set up similar to Facebook's in that users could specify during which hours of the day they will receive notifications. No more interrupted sleep.
I miss so many tests that something like this seems like a fantastic idea. Better notification = more testers = more feedback. Any takers?