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Being a night owl, I was joking around with a friend of mine that dentists like to schedule morning sessions to kick up a notch on the torture factor.

However, someone mentioned that pain tolerances are actually lower in the morning.

Is there any evidence for this?

Why would pain tolerance be lower in the morning than in the afternoon? Shouldn't it be the opposite, since your nerves are all rested, and more ready to take the beating of the day to come?

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Is there any reason at all why it should change during the day? – Lagerbaer Jun 3 '11 at 18:59
@Lagerbaer think about weightlifting or exercise. It will be much more painful if you're cold (you haven't warmed up). The body is perhaps not prepared for it. – whirlwin Jun 3 '11 at 19:15
But that is not a matter of nerves, more of blood circulation in your muscles – Lagerbaer Jun 3 '11 at 22:08

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