I've seen in shows on the paranormal where when there's a home with demonic activity, 3:33 am is a common time for the activity to occur - it's supposed to be like a slap in the face to the Divine, I think.
Oh yes, I just remembered - apparently 3AM is the time of the Devil because it's the opposite of 3PM which has some strong relevance to God. Was it when Jesus rose again? I can't remember, though I know it was explained.