Depends on the force used. Going along with the mention of "common sense" above, I reckon no pain or discomfort was caused and attracting their attention for a valid reason does not constitute bad manners. If I've got the OP wrong (I don't think so going by the follow up posts) that's all that happened.

Now if they'd been punched awake, had their hair pulled or dug in the ribs so hard it was painful, then that would be bad manners or worse, but we all know that didn't happen here.