Dead Bodies Sit Up 6 Hours After Death (Morgue Workers Explain Why) Dead for 6 hours. Suddenly sits up in the casket. This isn't a horror movie. It's ATP energy still stored in muscles causing random contractions for 12 hours after death. Your gut bacteria keep eating your body from the inside, producing methane and hydrogen sulfide. The gas pressure builds until it forces air out of the lungs. The corpse groans. Sounds like breathing. When enough gas accumulates, the pressure pushes the torso f

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What Types of Careers Work in a Morgue?