Masruq says: I asked Sayyidah Aishah (may Allah be pleased with her) about the deeds of the Prophet (peace and blessings be upon him), and she said: He (peace and blessings be upon him) loved the deed that is done constantly. I said: At what time would he (peace and blessings be upon him) pray? She said: When he (peace and blessings be upon him) heard the crowing of the rooster, he would get up and pray.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4660