You do not walk through a meadow or a forest with a lot of pollen around you which irritates the nasal mucosa. Sunlight, also a known and not yet well understood cause of the sneeze reflex, probably won’t bother you either. Nor are you plucking your eyebrows. Yes, there is a whole host of strange stimuli that make people sneeze. You are free from many of these while you sleep. The possibility of sneezing at night seems much smaller than during the day for this reason alone.
