Chilean Rose Tarantula won't move?

Ellsworth is pretty active, always walking around his cage especially when I have my lights off like now. But he hasn't moved places all day. I went and sprayed his cage some and usually when I do that he runs and hides inside his log but he just moved one foot. I'm actually pretty worried since this unusual. Do you think he's about to moult? He's my first tarantula and have had him for about a month and a half at most.