Narrated ‘Aisha:

A woman from the tribe of Bani Asad was sitting with me and Allah’s Apostle (p.b.u.h) came to my house and said, ‘Who is this?’ I said, ‘(She is) So and so. She does not sleep at night because she is engaged in prayer.’ The Prophet said disapprovingly: Do (good) deeds which is within your capacity as Allah never gets tired of giving rewards till you get tired of doing good deeds.’