Allāh ﷻ swears by the morning and the ten nights in the Qur’ān. Fajr time is the most blessed time. The nights are the first ten nights of Dhū l-Ḥijjah. Each day you fast between those ten nights are equal to a year. Make wuḍū’, pray two raka‘āt, sleep and wake for tahajjud and this is counted as iḥyā’ – qiyāmu l-layl.