Henry has worn these pjs before but we've never seen them glow until tonight. I attribute this fun surprise to the fact that we left the set out in a sunny room all day. The fabric absorbed enough light to activate the special effects this evening. At seven pm both boys were wearing Carter's pajama sets but only Henry's could be seen in the inky blackness filling the room.* Strangely, the spaceship, star and moon pattern on Liam's pjs did not show up in the dark. Apparently jungle animals are nocturnal; aliens are not.
*BTW when one tries to take a picture of glow-in-the-dark pajamas, all one gets is a photo of the dark.