Sayyidah Aishah (may Allah be pleased with her) said that he (peace and blessings be upon him) loved constancy in deeds. I said: "At what part of the night did he (peace and blessings be upon him) wake up?" She said: "When the rooster crowed."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4735