self-suggestion

It need not surprise us to find that appropriate artifices—hypnotism or self-suggestion—can carry the power of our will over our organism to a yet further point.

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.