Sleep is a temporary death. Death is a permanent sleep. So before this happens, turn to Allah before you return to Allah ! Do not sleep during prayer time. As-salatu Khayrum Minan-nawm الصلاة خير من النوم is better than sleep
Qur'an al-Isra' (The Night Journey) Establish prayer at the decline of the sun [from its meridian] until the darkness of the night and [also] the Qur'an of dawn. Indeed, the recitation of dawn is ever witnessed.