Humayd reported,

Anas was asked about the night prayer of the Messenger of Allah ﷺ. He replied, "Whenever we wished to see him praying during the night, we would see him praying, and whenever we wished to see him sleeping, we would see him sleeping. He would fast so much in a month that we would say he never breaks his fast, and he would go without fasting so much that we would say he never fasts."

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عن حميد قال

سئل أنس عن صلاة رسول الله ﷺ من الليل فقال ما كنا نشاء أن نراه من الليل مصليا إلا رأيناه وما كنا نشاء أن نراه نائما إلا رأيناه وكان يصوم من الشهر حتى نقول لا يفطر منه شيئا ويفطر حتى نقول لا يصوم منه شيئا