I Think MY SUGAR GLIDERS SICK!?

this might sound stupid,he could be trying to tell you something,has he got food and fresh water,did you move something in his cage ,or change something,I just about bought those a few years ago,and decided on a quaker parrot instead,but thats the kinds of things he does when there's something not right in his cage,or when he needs food and water,............just a thought,Greg