What is the ruling for one who dozes off during prayer and misses part of it?

Question:
He says in another question: A worshipper sat with the imam in the middle sitting, and when the imam stood up for the third rak'ah, the worshipper did not stand with him because he was drowsy. He fell into a light sleep during the recitation of the tashahhud and remained asleep until the imam completed the third rak'ah, which is a secret prayer, of course. When the imam said the takbir for ruku', the worshipper woke up and stood, and he found that the imam had already risen from ruku'. How does this worshipper complete his prayer?

Answer:
If he dozed off and remained in his sitting until the imam bowed, he should stand and bow with the imam. If the imam precedes him in bowing, he should bow, then catch up with the imam and prostrate with him. He should bow, then rise and straighten his back, then catch up with the imam, and this suffices for him. If it was drowsiness that did not remove some awareness or alertness from him, but he did not notice the takbir, and he did not fall into deep sleep.
As for if he fell into deep sleep, his prayer is invalid, meaning he must restart it from the beginning, because deep sleep invalidates the wudu'. However, if it was drowsiness, a light sleep, and he did not fall into deep sleep, he should follow the imam, and the recitation of al-Fatihah is dropped from him, because in this state he did not intentionally leave it out, but sleep overtook him. Yes.

The presenter: May Allah reward you with good.