Nicholas is obsessed with glow sticks. If there is a glow stick around, he must crack it and play with it, regardless of how bright it may already be in the house. Of course, it's more fun to play with glow sticks at night time when it's dark. But if he cracks a glow stick before bedtime then there is this feeling that you must stay up for a while to play with said glow stick since it's brightness will fade during the night. So we sometimes stay up way too late, but it's worth it for the sake of some glow stick fun!