In alpha and beta versions of Minecraft (prior to Minecraft's 1.0 release), if you attempt to go to sleep in an 'unsafe' area, there is a chance you will be woken up by an enemy mob.
If you sleep in a bed which is unsafe according to the game's rules but does not actually have an ordinary path to a dark area, is it ever possible to be woken up by a creeper, with the attendant risk of damage to structures?
I ask because I have slept in a somewhat-unsafe bed many times, and only ever met a zombie or skeleton, but never a creeper or spider, and I want to know whether I've just been lucky so far.