I personally feel that the numbers of the bogeymen are kind of a problem with the whole fear thing. Right now it's more: "Don't go out into the night because you will be swamped by a horde of bogeymen", rather than "Don't go out into the night because the bogemen will get you".
What I reccomend, is reducing the numbers dramatically. Then pumping up their power dramatically, so they're about minataur level dangerous. Bogeymen should be something you run from, not try and fight your way out of. They could also be based on the adventurer's fears, which would make them much cooler.
Another thing to do is to make it random, say, 2 out of 5 times you go sleep outside during the night, in an unsafe place. If you don't have a campfire. And if you do have a campfire, say, 1 in 15 chance. Also, you should not be immune just because you have companions, just reduce it to to around 1 in 15 again, or 1 in 30 if you have a campfire.
A very important thing is that bogeymen are your fears. When you face them you should be alone. For example, if you're off adventureing with your miniture army, they should all be completely asleep when this happens, and you unable to wake them, however you would go about doing that. And, if, for example, you ran into a city with a bogeyman pursueing you, all the doors should be locked.
The only way to get rid of the bogeyman is to run away for long enough, wound him enough then run away, or defeat him in battle. Defeating him in battle should be hard, and you should suffer penalties for being absolutely pans-wettingly scared. But, if you do manage to beat the crap out of this bogeyman, you will never be troubled by him again.
I just realised that I've been refering to the bogeyman as him all the way through that. I guess that's how I personnify my horrors.