The so-called sleeper effect means that your speech suffers from "mid-speech sag" and therefore invites your audience to doze.

Question

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The sleeper effect is a psychological phenomenon where a message that was initially disregarded or not believed gains credibility over time, often because the source of the message is forgotten or dissociated from the message itself, not a phenomenon related to a dip in engagement during a speech.

The So-Called Sleeper Effect Means That Your Speech Suffers from "Mid-Speech