Minecraft wiki entry for Nomadic_experience, associated text: This shelter is useful if you don't want to be surprised on your wake by mobs and see the sun (you can clean the area around with a bow and an arrow). However, building a pillar without overhangs is not advisable since spiders can climb the pillar. This is easily circumvented by making overhangs on top of the pillar to prevent spiders from climbing up the pillar and harming the player sleeping in bed.