What are the suitable verses to recite or write for someone suffering from extreme fear and jumping during sleep, and is ruqyah with water sufficient?

There are no specific Qur’anic verses designated for recitation upon one who experiences fear. However, the legal ruqyah (exorcism) using the Qur’an, adhkar (remembrances), and legitimate supplications is beneficial. There is no harm in reciting them into water or oil. Furthermore, maintaining purity before sleep and observing the remembrances before sleep help in preventing fear. If the fear is due to disturbing dreams, there are etiquettes that the Prophet (peace and blessings be upon him) guided us to.