Eating Prior to the Fast

One may eat and drink the entire evening until dawn (6:05am), provided that either of these conditions are met:

• One didn’t go to sleep for the night. [Dozing off is not regarded as such.]
• One stipulated (preferably verbally) before going to sleep that he would eat upon awakening. In this case, one washes Neggel Vasser and recites the morning Brochos before eating.