It was narrated from Anas (may Allāh be pleased with him) that the Prophet (May Allāh praise him and Peace be upon him) said, whoever forgets a prayer is to make it up when he remembers it. That is the only expiation for it {and establish prayer for My remembrance} [Reported by Bukhārī: 597]

It was narrated from Abū Qatādah that Allāh’s Messenger (May Allāh praise him and Peace be upon him) said, “You are not deemed negligent when you are asleep. You are only deemed negligent if you are awake and delay your prayer until the time of another prayer” [Ṣaḥīḥ Sunan Abī Dāwūd: 425].