The nightlight option offers two different settings for lighting. One setting is a constant, stay-on mode that can be adjusted to your preferred brightness. The second setting is the “running lights” mode. This mode delivers a mesmerizing light effect that starts at one end of the bassinet and moves through the sides to the opposite end before starting over. This mode is designed to help grab the attention of your baby to help lull them to sleep, much like an evening car ride.