Yup... I have dozed off to sleep a few times in my Summit Viper X4. That climber is so comfortable, it's like a Lazy-boy recliner 22' up in a tree!

[8D] As long as I have my harness (I don't even THINK of climbing the tree without it!), I know I'll be safe and secure and can nod off to sleep if the opportunity calls for it.