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What is the difference between advice from an authority and that from a researcher?
Insomnia
A sleep disorder characterized by difficulties in falling asleep, staying asleep, or obtaining restorative sleep.
In-
A prefix used to indicate negation or absence.
Retro-
A prefix meaning "backwards" or "behind," used in various contexts including medical terminology to denote location or time.
Backward
Denotes a movement or action directed towards the rear or in reverse.
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