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Magzie: The reason so many of us use walls and don't push for a bed is the amount of time it takes for a sufficient mass of zombies/skeletons to congregate inside the pit traps/trenches. Also, it's cooler at night which means less water consumption during the vital early gameplay. And not having to rely on Minecraft's pitifully short item render distance to find all those bones and rotten flesh is a really big deal. 20 minutes into the game w/o Special Mobs (it still lags my computer) and I have nearly a stack each of rotten flesh and bones. Plop down a barrel or two, sift some dirt, grow some rice, make a slab furnace, and I'm often sitting on a full stack of 1x compressed dirt by the time I have supplies in order for my city expedition (and this is with zero ore smelting). Is it the only way, or the fastest way? Certainly not. But I love the aesthetic value of a statue outside my ship, built out of compressed dirt blocks. :]
So, the place most of the zombies seem to be spawning in my compound is in midair, directly above my drowning trap. I've been suspecting for some time it may be related to what item is being held by the player at the time, haven't done any testing to verify though. Real life's been pretty crazy :\