What are your ambient temps? I noticed mine doing similar right after temps started dropping here. In fact she was getting in the top of her fake vine and sleeping right under her lamp and then I realised her ambient temp was dipping a little below 75 at night. I changed out her 50 watt bulb to a 100 with a dimmer. Now I keep her temps better and she stopped sleeping in the tree tops. She still roams a lot at night and stretches up to the light and the screen but not sleeping there anymore. She's even sleeping out in the open some but not close to the bulb. She's only about 3 months old.

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