Hisham bin Urwah (may Allah have mercy on him) narrates from his father that a woman of the Banu Asad tribe came to Sayyidah Aishah (may Allah be pleased with her). The Prophet (peace and blessings be upon him) came in and asked: "Who is this?" Sayyidah Aishah (may Allah be pleased with her) said: "This is so-and-so, who does not sleep at night." The narrator said: her prayer was mentioned, and he (peace and blessings be upon him) said: "Take upon yourselves only as much as you are able to do. By Allah, Allah Almighty does not grow weary until you yourselves grow weary." The narrator said that Sayyidah Aishah (may Allah be pleased with her) said: "The best worship is that of the person who is constant in his worship."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4737