Quran 18:18

وَتَحۡسَبُہُمۡ أَيۡقَاظً۬ا وَهُمۡ رُقُودٌ۬‌ۚ وَنُقَلِّبُهُمۡ ذَاتَ ٱلۡيَمِينِ وَذَاتَ ٱلشِّمَالِ‌ۖ وَكَلۡبُهُم بَـٰسِطٌ۬ ذِرَاعَيۡهِ بِٱلۡوَصِيدِ‌ۚ لَوِ ٱطَّلَعۡتَ عَلَيۡہِمۡ لَوَلَّيۡتَ مِنۡهُمۡ فِرَارً۬ا وَلَمُلِئۡتَ مِنۡہُمۡ رُعۡبً۬ا ١٨

You would think that they were awake, when they were in fact asleep. We turned them to the right side and the left side, while their dog stretched his arms in their midst. Had you looked at them, you would have fled from them, stricken with terror.