Jumping at UVB?

[Spoony]

Something I've noticed Zero doing almost every morning (he just did it twice today) is he'll run along the bottom of his viv looking up at his UVB bulb (it's attached to his screen viv top) and then jump at it. He always jumps at the same end (the end of the fixture with the switch) and I was just wondering what this might mean. It's too high for him to reach so he doesn't get too close to it, it's just weird.

Anyone have any ideas or have you experienced this too?

Thanks in advance,
Spoony.