Do you have any hides available? They do like to sleep in nice warm dark places during the day, if they have gotten too big to hide behind leaves, they may be trying the next best thing. Our little girl likes to hang out in an plastic orange (orange the fruit, I thought it was funny when I bought it) that we offer. It was originally intended for hamsters I think, but anything that can handle the humidity will work. Basically, they are looking for shelter most likely. The other possibility is humidity. They could be looking for a wetter environment. Check you humidity levels.
All geckos, no matter what species should be offered a hide or two for comfort. If all temps and humidity look good, I'd start there. Good luck.
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0.1 Albino Leo Gecko
0.1 Crested Gecko
1.0 Dear Boyfriend
Departed: Harvey and Spock