عَنِ ابْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا قَالَ: كُنَّا فِي زَمَنِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ نَنَامُ فِي الْمَسْجِدِ نَقِيلُ فِيهِ وَنَحْنُ شَبَابٌ
Sayyiduna Ibn Umar (may Allah be pleased with him) says that in the time of the Messenger of Allah (peace and blessings be upon him), we used to sleep in the mosque, we used to take a midday nap, even though we were young men.