Among His proofs is your sleeping during the night or the day, and your working in pursuit of His provisions. In this, there are sufficient proofs for people who can hear.
وَمِن ءايٰتِهِ مَنامُكُم بِالَّيلِ وَالنَّهارِ وَابتِغاؤُكُم مِن فَضلِهِ إِنَّ فى ذٰلِكَ لَـٔايٰتٍ لِقَومٍ يَسمَعونَ
wa min Aayaatihee manaamukum bil laili wannahaari wabtighaaa’ukum min fadlih; inna fee zaalika la Aayaatil liqawminy yasma’oon