In Minecraft, everyone seems to able to use beds for mining or killing the Ender Dragon, but whenever I use it I blow up instantly.

Is this a bug, or how can I be immune to this damage?

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2 Answers

In order to survive, you are supposed to place a block in front of the bed and click it as far away as possible (around 5 blocks), without being positioned right beside the block in front of the bed. This is so the block will take the main explosive damage of the bed, not the player. Additionally, try to use a block with high blast resistance, such as obsidian, as it will absorb more damage than a block such as wood. A bed explosion in the Nether or the End is the second most powerful explosion possible. It is as powerful as a charged creeper (which does 97 damage points on normal mode) and is much more powerful than TNT.

Source: I have done many experiments on this.

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According to this link:

Damage depends on "exposure" of your whole bounding box, not just feet. The best result I obtained is placing stone + stone stairs (on top) and activating bed from a quater of a block hole created by stairs. tried with some more blast resistant materials, but with no improvement.