In a dream it indicates a wife for an unmarried man, and for an unmarried woman a husband who covers her with his kindness. Putting it up and going under it may indicate covering oneself with deeds, cunning, trickery and hypocrisy.
Dream meaning · al-Nabulsi
Mosquito net (canopy) بشخانات
Source: al-Nabulsi, Ta'tir al-Anam fi Ta'bir al-Manam, p. 32. English translation by iDreamBot. Quran verses: Quran.com, Saheeh International.