Sedation

[sɪ'deɪʃ(ə)n] or [sɪ'deʃən]

(noun.) the administration of a sedative agent or drug.

(noun.) a state of reduced excitement or anxiety that is induced by the administrative of a sedative agent.

Edited by Guthrie--From WordNet

(n.) The act of calming, or the state of being calm.

Typed by Jaime