'Aishah was asked about the actions of the Messenger of Allah (ﷺ). Did he perform some actions exclusively on some particular days ? She said: No, he performed his actions regularly. Which of you has the strength as much as the Messenger of Allah (ﷺ) had ?
Sunan Abi Dawud Book 5, Hadith 121
← Previous Hadith The Prophet (ﷺ) called 'Uthman b. Maz'un. When he came to him, he said: 'Uthman, did you dislike my practice ? He said: No, by Allah, but I seek your practice. He said: I sleep, I pray, I keep fast, I (sometimes) leave fast, and I marry women. Fear Allah, 'Uthman, your wife has a right on you, your guest has a right on you, your self has a right on you ; you should keep fast and (sometimes) leave fast, and pray and sleep.

Sunan Abi Dawud Book 5, Hadith 120 Next Hadith → The Messenger of Allah (ﷺ) used to commend prayer at night during Ramadan, but did not command it as duty. He would say: If anyone prays during the night in Ramadan because of faith and seeking his reward from Allah, his previous sins will be forgiven for him. When the Messenger of Allah (ﷺ) died, this was the practice, and it continued thus during Abu Bakr's caliphate and early part of 'Umar's.

Abu Dawud said: This tradition has been transmitted by 'Uqail, Yunus, and Abu Uwais in like manner. The version of 'Uqail goes: He who fasts during Ramadan and prays during the night.

Sunan Abi Dawud Book 6, Hadith 1