Why Does The Snooze Button Give You Only 9 More Minutes of Sleep?

"A question. Since before your sun burned hot in space, and before your race was born, I have awaited... a question."
Why do most snooze buttons only give you nine more minutes of sleep? I've wondered that before. Now through the power of the internets, we have an answer.
Credit also given to the Guardian of Forever. Enjoy.

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