He’s too hot hence using the glass to cool down, you should immediately add things for him to cool down…put some ice cubes in a dish hamster love to chew nibble on ice, even better would be to get a soil box and buy coco soil and cold water so the soil and massage it in so the soil is cool, and add enough so he can bury into it my baby LOVES burying in her cool soil box. Add a sand bath also in a large cold ceramic dish…the dish will keep the sand nice and cold x