Creative problem solving when not at your best often works because when you are fatigued, the mind increases its filtering mechanisms thereby screening out ineffective ideas.

Creative Problem Solving

An approach to finding innovative solutions to problems through imaginative and often unconventional methods.

Fatigued

The state of being extremely tired, exhausted, or lacking energy, often as a result of physical or mental activity.

Filtering Mechanisms

The processes used to sift through information to retain only what is necessary or relevant, often to avoid overload or to focus on specific criteria.