Ok, don't freak out, Dr. Krentist really isn't under your bed... or is he? You know the other day when there was a dentist drill in your dream making that horrible noise (you know the one they make)? It wasn't actually a dream, the Dr. has been prepping his tools for work on you while you're sleeping. He's just biding his time until that moment when you drop into a DEEP sleep, then BOOM!... root canal!