Calming ideas, not worrying (8)

I believe the answer is:

sedation

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'calming' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

'ideas not worrying' is the wordplay.
'worrying' indicates an anagram.
'ideas'+'not'='ideasnot'
'ideasnot' is an anagram of 'SEDATION'.

Can you help me to learn more?

(Other definitions for sedation that I've seen before include "Effect of calming drug" , "Calming with drugs" , "State of drug-induced calm" , "The administering of sleep-inducing drugs" .)

I've seen this clue in The Mirror.

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