As for what Ibn Abi Umayr narrated, from Hafs ibn al-Bakhtari, from Abu Abdillah عليه السلام, peace be upon him:
Imam عليه السلام said: “The one who is unconscious makes up the prayer of three days.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 313