وَمِنْ ءَايَـتِهِ

(And among His signs) indicating His magnificent power.

خَلَقَ السَّمَـوَتِ وَالأَرْضَ

Fourth sign of divine omnipotence

Human sleep and economic activities both in daytime and at night have been mentioned in verse 32 as the fourth sign of Allah's omnipotence. Unlike some other verses, both night and day have been mentioned in this verse as times of sleep; similarly, economic activities are mentioned as activities performed both in daytime and at night. In other verses, sleep is described as something done at night, and earning of sustenance as an act of daytime. The reason is that the major purpose of night is to sleep, and some economic activities are also performed as a secondary function. The case of daytime is the opposite, where the major objective is to work, while a little time may be spent in having rest and sleeping. Therefore, both descriptions are correct. Some commentators have tried to interpret this verse in a way that sleep becomes restricted to night and earning of sustenance to daytime, as mentioned in other verses. However, in the light of explanation given above, such a labored interpretation is not called for.