[Shelleyzeus]

Hi everyone I'm new to this forum. Last week I got two new hamsters for my two daughters. We got a Syrian hamster which I have had when I was a child and a winter white dwarf hamster. My question is when my winter white is out playing and zooming around the cage like a mad one, he will all of a sudden drop and lie down where ever he drops. Is this normal? I've just never seen it before with Syrian hamsters so just got a bit worried