What is sufficient protection for someone who feels a terrifying prickling caused by an invisible entity during sleep, and is reading the Qur'an, reciting dhikr, and performing prayer enough for protection, or is ruqyah necessary?

What often happens are nightmares caused by Satan, and one is protected from them by observing the remembrances before sleep, such as Ayatul-Kursi. The reason might also be a physical illness, and it is advisable to see a specialized doctor or seek a legitimate ruqyah practitioner.