Minecraft wiki entry for Things_to_do, associated text: If new, the player can dig down three blocks and block of the roof and put a torch to see, and when the player think it's day, they can break the top. If not, the player can block it of again. After being skilled enough to beat a raid, it is most recommended to always hold the totem of undying in your offhand to survive when the you died while still being able to hold another item but the totem still activates.