To ensure that a sleeper effect may occur, it is important that the source precedes the discounting cue. If the the discounting cue precedes the source, its impact may be weakened and it may form a single memory unit with the source. 

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- Opposite impact
- Sequence of source and discounting cue

Conditions for the Differential Decay Hypothesis

Pratkanis, A. R., Greenwald, A. G., Leippe, M. R., &amp; Baumgardner, M. H. (1988). In search of reliable persuasion effects: III. The Sleeper Effect Is Dead: Long live the sleeper effect. Journal of Personality and Social Psychology, 54(2), 203–218. https://doi.org/10.1037/0022-3514.54.2.203 

In Search of Reliable Persuasion Effects: III. The Sleeper Effect is Dead. Long Live the Sleeper Effect.

The message and the discounting cue must have strong and opposite impact. Therefore, if the message supports one idea, the discounting message should not support it.

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