I can be a puzzle without pieces, and I can be a mystery without clues. What am I?

Category: Brain Teasers · Difficulty: expert

Hint: Consider something that occurs during sleep that often lacks clear structure.

Answer

A concept

Explanation

Dreams can be convoluted and puzzling, often leaving one with questions rather than answers.

This is a expert brain teasers riddle — one of the harder riddles here. The answer is A concept.

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