What? You don't have a ready supply of glow sticks? But they're so hackable! They're great as nightlights, both at home and while traveling, they are (silent!) no-effort entertainment, they are great at amusement parks and other crowded evening venues, and they even make bathtime more fun.
See? You just didn't know you needed glow sticks.
At Amazon: 100 8" Glow Light Stick Bracelets, $8.95 with free Amazon Prime or Super Saver shipping (and counts toward your Amazon Mom purchases)