Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Supplication in a dream indicates the fulfillment of needs and achieving goals. If it is with screaming, it is calamity and strife. Supplicating in darkness indicates salvation from worry.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Supplication indicates worship. It may also indicate a baby boy. Whoever sees himself supplicating for himself will be blessed with a son.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Supplication is interpreted as worship. Whoever sees himself supplicating to God will have his prayer answered.