Does feeling extremely drowsy and dozing off during the last sa'i, Tawaf al-Ifadah, and Tawaf al-Wada' invalidate the Hajj?

Scholars have differed regarding the permissibility of combining Tawaf (definition) Al-Ifadah and Tawaf Al-Wada' (farewell circumambulation) with the intention of only Al-Ifadah, or with the intention of both. The preponderant opinion is that it is permissible. It is also permissible to delay Sa'i until after this Tawaf, based on the story of Aisha (may Allah be pleased with her). As for feeling drowsy during Tawaf, it appears that this did not nullify the Wudu' (ablution); because the sleep that invalidates Wudu' is deep sleep. So, the Tawaf is valid in this case. However, if the drowsiness reached the extent of nullifying Wudu', then the Tawaf is not valid, and it is necessary to repeat it and to repeat the Sa'i after it, and a sacrifice (Dam) is required for leaving Tawaf Al-Wada'.