How can you soundproof a room in a flat?

Mary
by Mary
The walls of the flat (appartment) are quite thin. At night lying in bed I keep hearing the noise of the lift (elevator) I own the flat so it's okay for me to do work to it. It's really annoying. I have asked the people who manage the building if they can soundproof the lift instead but they won't. Please can anyone help? Thanks. X

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