My guess - and it is totally a guess - for the change in eating habits is that he's finally up to a good weight and now recognizes that food will come regularly. He might just not be hungry. You might try cutting back on the amount you feed just a tiny bit until you're sure he IS eating.

As for the sleeping thing - I don't know. I never kept brown anoles and don't know what is normal for them.
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Torey
Eugene, Oregon, USA
1.1 Saharan Uros (Joe and Arthur)
3.0 Mali Uros (Spike, Turtle, and Tank)
1.1 Ornate Uros (Scuttlebutt and Shazzbot)
1.1 Collared Lizard (Ripcord and Rorschach)
2.0 Green Anoles (Bowser and Sprocket)
1.1 Chubby Housecats (Roscolux and Jenny)