Glow in the dark

Lucas got new pyjamas when we got to Mormor & Morfar. He was very happy, because they were "Spiderman-ones", well, kind of... they had a spiderweb on them. And, they are glow-in-the-dark.
So every evening Morfar has to charge them up before Lucas can go to bed. Luckily he's got just the right thing!