I'm trying to wade through what people think you have and what you have stated that you have.

1. The heat source is an overhead light. Correct?

2. There is no under tank heater - Correct?

3. You mentioned that this behavior has been going on for a week. Have you had the snake longer than a week, or did you get the snake a week ago?

4. For your heating set up, if you are using an overhead head lamp/light, what type are you using and where is the light in relationship to the hide?