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I think we should probably be careful not to be too judgemental on this. People often know their 'limits' and a one-size-fits-all approach is only really useful in a legislative sense. We all employ mental tricks to get us through various things: the fact that Moar tells herself she can close her eyes, doesn't actually make her a dangerous driver. Many, many people drive when tired. I wuold imagine half the people commuting in a morning do so with a stifled yawn.
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