Surah 76. Al-Insan, Ayah 26

I.e., at all times of wakefulness.

I.e., "whenever unhappiness oppresses thee and all seems dark around thee".

 This verse refers to the five daily prayers: the dawn prayer, then noon and afternoon prayers, then sunset and late evening prayers, respectively.

 Extra prayers offered at night. See 73:20.

See last note. (2) Humble prostration to Allah means some visible mode of dedication. That is best done at night, when the soul, free from worldly occupations, is alone with its God. (3) The weary hours of a long night are no longer weary, but become full of meaning when we join in concert with the whole Creation, which glorifies Allah: lvii. 1.