Minecraft wiki entry for Mining, associated text: Beds do have the problem of having no fuse time before exploding, making it very likely for the player to take some damage.Furthermore, beds blowing up do not cause nearby beds to explode, meaning each one has to be manually blown up. Beds are also not stackable, which limits the maximum length of mining sessions considerably. This is partially negated by instead carrying wool and planks with you, which are crafted into beds as you go.