There goal is to harass you all night in the black forest so after an all nighter of tree cutting, you cut down a whopping 3 trees. I seriously have had nights like this in early game. The basic ones are trivial, but at night the brutes and shamans (occasional 2 stars) require you to dispose of them instead of chopping trees. Then the swarms of 5-6 happen, then another brute. Before long its day break and you can actually fell some trees.

Now one could lay a carpet of benches 1st, like a good do not disturb sign. But I feel like there big purpose is to actaully level weapon skills, even unarmed for the helpless ones.