Hi!
Sometimes yes they do that, but just to make sure that there is not a problem and soemthing is not bugging him to cause him to react; what types of lighting are you using? is it Coil, Floresent strip, MVB and what brand of lighting? Also what do you messure your temps with? Stick up, digtal with probe, gun, round Dial types?
Just fyi he shoudl not be bashing himself into the glass. Trying to climb it and sort pushign his nose against it is a bit normal.
Thanks!