33. Vereinov only painted at night because they did not let him paint during the day.
Analysis: The text states, "Since he had no control of his hands, Vereinov used his mouth to hold his paintbrushes. The problem was that the people at the hospital were afraid he would hurt himself, so he wasn't allowed to paint, which is why he did all his works of art at night, in secret." This explains the reason for painting at night was due to hospital restrictions stemming from safety concerns about his method of holding the brush.
Conclusion: Vereinov painted at night due to hospital restrictions and fear of self-harm.
Mark: T (True)