Sleeping in a tree bugged?

[Bubba Fett]

If I'm on an overnight trip I'll usually try to find a horizontal tree branch or high ledge to sleep on so I'm safe from predators.
In spite of sleeping for 6 to 8 hours and the sleep circle being full size I'll often immediatly start getting the sleepy eyes animation.
Last time this happened I got poisoned since you can't hear properly when it happens and I got bit by a snake I should have easily been able to dodge.

Anybody else running into this sleep not resting thing?

[Vosu]

I think the game has some great mechanics.
See, early hominids were not sleeping on the trees. They evolved in lush areas like the savanna later in the game, and lost their dexterious feet even before the ♥♥♥♥ genus. There's some discrepancy but archeologists generally agree that hominids were closer to humans in that they were living more on the ground, and used the trees and high places only to escape from predators, but preffered areas with water and fruit closeby, so would rather choose that than a tree top.
I think the developers took that into account, so not much tree sleeping for our apes. Either that or there's a bug you need to report.