My U. henkeli climbs on whatever is convenient in his cage (a 60 gallon reptarium fully planted).  I have many vertically oriented pieces of bamboo and cork (includign a cork bark back wall) in his cage, and he tends to sleep on the cork and the bamboo equally... I think he just points himself down and falls asleep wherever he happens to be when the lights come on...lol!
 
Jared

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