Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
Darkness in a dream is confusion and misguidance. Walking in darkness indicates delving into falsehood and heresy. Emerging from it is salvation from worry, grief, and repentance.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
Darkness indicates oppression and injustice. For the disbeliever, it is torment, and for the believer, loneliness and worry. Sitting in darkness is unemployment from work.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
Darkness is interpreted as worry, grief, and hardship. Whoever sees himself in darkness then emerges into light will repent, his situation will improve, and he will become wealthy after poverty.