"The Messenger of Allah ﷺ said: 'There is no negligence when one sleeps, rather negligence is when one does not offer one prayer until the time of the next prayer comes and he realizes that he has missed a prayer.'" (Using translation from Nasāʾī 616)
قَالَ رَسُولُ اللهِ ﷺ «لَيْسَ فِي النَّوْمِ تَفْرِيطٌ إِنَّمَا التَّفْرِيطُ عَلَى مَنْ لَمْ يُصَلِّ الصَّلَاةَ حَتَّى يَجِيءَ وَقْتُ الصَّلَاةِ الْأُخْرَى حَتَّى يَنْتَبِهَ لَهَا»