What is the ruling on one who is overcome by drowsiness during Fajr or Jumu'ah prayer?

There is no doubt that Satan is an enemy to man, and one of his goals is to hinder the remembrance of Allah. The drowsiness that affects some during Fajr or Jumu'ah prayers is from Satan, and its cure is to seek refuge in Allah by seeking protection from Satan and eliminating the causes that bring drowsiness, such as physical exhaustion and regulating sleep times. The Prophet, peace and blessings be upon him, clarified that Satan ties three knots on the head of anyone while he is sleeping. If he wakes up and remembers Allah, one knot is untied. If he performs ablution, another knot is untied. And if he prays, the last knot is untied.