A few tips I've found to deal with bogeymen:
1]One of the biggest problems with fighting bogeymen (or anything at night really) is you're usually drowsy. If you think you'll have to deal with bogeymen that night sleep 4 hours starting a bit before dawn breaks, and fast travel until they ambush you.
2]Bogeyman slaying is really all about the RNG. They have the advantage by force of numbers and (usually) speed. If you're not good at wrestling/biting it's a good idea to dual wield a spear and a hacking weapon. Stab them with the spear and when it gets stuck in them, hack them to bits. You see they can't roll or jump out of the way while impaled (this is also a good way to kill peasant hordes). They're also really small so each hit should de-limb them, causing massive blood loss.
3]If you're positive you can't take them then you can stealth nearby and wait for dawn. The bogeymen won't move and if something terrible happens you're more likely to survive because you're not deadbeat drowsy.
4]Bogeymen won't initially ambush you when you sleep in: Mountains, Lairs of any type, the Coast, the Wild, and any settlement.
5]If you want to outrun the bogeymen but aren't very fast, charge any that catch up. They'll probably fall over and get a speed penalty.
6]Bogeymen corpses are
really good at killing other bogeymen and they're pretty light. All bogeyman traces will disappear when the sun comes up though, so you'll need to get a new one each night
7]The best way to survive a bogeyman encounter has (almost) nothing to do with armor, it's all about dodge and speed. If you use armor you'll want a
very high armor use skill or it may lead to your death.