the.com/sedation

means The use of drugs to calm a person, reduce pain or anxiety, or induce a sleep-like state, usually before a medical procedure.

from From Latin 'sedare' meaning to settle, calm, or still — itself related to 'sedere,' to sit. The same root that gives us 'sediment' (stuff that has settled down) also gives us this word for a mind being settled down. To sedate someone is, etymologically, to make them sit still.