self-suggestion

It is sufficient to point out that in order to make self-suggestion operative, no strong belief or enthusiasm, such as those schemes imply, is really necessary.

Nor is it always necessary that the mind of the patient should be influenced by another person; self-suggestion is at times equally efficacious.

Suggestion exerted by the circumstances is about the same as what is often called "auto-suggestion" or "self-suggestion".

I passed out temporarily just as a result of self-suggestion.

You were mentally tired, there was some self-suggestion for sleep.