Your pyjamas are made from luxuriously light bamboo fabric; they're warm in the winter and wonderfully cool in the summer. But this also means they can snag. Watch out for sharp corners, sharp nails and just generally sharp things, except you, as a sharp dresser.
Wash your pyjamas at no more than 40 degrees, the cooler the better. For your pyjamas and the environment.
Don't tumble dry. But if you do sometimes, that's okay. They won't melt.
Don't iron. But why would you.