What is that smell????

I got up at 5:45 this morning to a god aweful smell so I started looking smelling around the house when I got to the kitchen there was a note {Sorry for the smell look in the oven} so I opened the oven and there was a burnt to a crisp pizza. Well I woke up my husband and asked him what happenend.... He fell asleep while cooking a pizza our dog Braddock woke him up pawing and licking him. All I have to say is thank god for my dog or we would have a burned down house. And Brandon no more cooking late at night!