Tirmidhi

1791. Commentary: However, two things should be kept in mind. ➊ The time should not be one in which performing voluntary (nafl) prayers is disliked (makruh). ➋ Instead of praying an odd number, one should add an extra rak‘ah and pray an even number. This applies when one intends to perform the night voluntary prayers (nawafil). However, if the sole intention is to perform only the witr prayer, then there is no harm in praying an odd-numbered witr. And Allah knows best.

Hadith Commentary: Benefits and Issues: If a person has a regular recitation (wird), devotional practice (wazifah), or deed during any part of the night, and for some reason is unable to perform that deed or practice at night, then in order to maintain consistency and continuity in it, he should perform it during the day before the time of Zuhr (midday prayer). In this way, it will be counted as if the deed was performed at night, and its continuity will remain intact.

1313. Commentary: Benefit: Making up missed voluntary (nafl) prayers is recommended and desirable (mandub wa mustahabb).

Benefits and Issues:

➊
It is permissible to establish a regular practice of reciting a specific portion of the Noble Qur’an in the prayer of Tahajjud (night prayer).

➋
There is no disliked (makruh) time for recitation (tilawah) and remembrance (dhikr and adhkar).

➌
The reward for night-time supererogatory prayers (nawafil) and recitation is greater, but in the mentioned circumstance, the full reward will also be granted during the day.
In other words, a valid (shar‘i) excuse is recognized by Allah, and any shortcoming that occurs due to it will be considered nullified.