שולחן ערוך אורח חיים · סימן תקס״ד

English

On every fast that one eats at night, whether it is a communal or individual fast, one may eat and drink until dawn. This holds if one does not sleep (for a long time) (Tur), but if one sleeps (for a long time), he may not go back and eat and drink unless he made a condition [prior to sleeping] to eat and drink. Rem"a: There are those who say that drinking requires no condition, as we assume that a person intends to drink after sleeping and it is as if he made the condition (Tur, Mordechai, Hagahot Maimoniot, and Hagahot Ashri).