I saw the first clip last week and laughed, though I felt a bit bad for the dog hitting the wall. However I then noticed there are several clips of this dog doing the same thing, and this one in particular stood out to me:
http://www.youtube.com/watch?v=h-0dzKH1Rfs
I have to admit if my dog did this constantly and especially the standing and twitching. This could possibly be postictal behavior though of course it may not. In any case the dog seems to at least have some sort of sleeping disorder or neurological difference going on here. I just would be a bit freaked out and concerned if one of mine were doing this and with such consistency, but perhaps she has had Bizkit checked out and things are fine.