مَنْ نَامَ عَنْ صَلَاةٍ أَوْ نَسِيَهَا فَلْيُصَلِّهَا إِذَا ذَكَرَهَا
Translation: Whoever sleeps through a prayer or forgets it should offer it when remembered.
The hadith establishes that sleep or forgetfulness does not extinguish the duty to perform the prayer.