What Happens When you Sleep with your Glow-in-the-Dark Bracelet

I had a bunch of glow-in-the-dark bracelets left from last year and I gave them to the girls to play with after we got home from trick-or treating:

Audrey took hers to bed with her and one of them cracked open in the middle of the night. This picture is of the mattress pad - I had already removed the sheet to wash it but it has a bright green circle on it as well.

Audrey was in my room twice last night complaining that it was keeping her from sleeping. I explained to her as calmly as I could at 2am, that I was not changing her sheets and she was going to have to find a way to fall asleep. I guess she eventually did .......