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I've had a couple running events recently that have been pushing my endurance (a competitive half marathon, and running 20+ trail miles for a fun-run). The night following these events I've woken with night sweats--sweating profusely in my sleep (yes, it's definately sweat).

Internet searches turn up different mentions of it and supposed explanations. I'm curious if there's any objective information about whether it's a common side-effect of hard training, or if it's indicative of either going too hard or doing something incorrect (e.g. some claim it's a side-effect of taking in too much salt).

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Do you mean the night before, or after? – Dave Newton Nov 12 '12 at 20:36
Hi Dave, it's been the night after the event. So run 20 miles, go to bed, wake up drenched in sweat. – STW Nov 12 '12 at 20:40
Huh; never experienced anything like that. Interesting. – Dave Newton Nov 12 '12 at 20:41 might point in the direction of an answer – FredrikD Nov 13 '12 at 12:35

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Night sweats can be related to an increase in exercise intensity due to the affect of exercise on the endocrine glands and hormone secreations. In general, excessive sweating at night is caused by hormones. That is why menopausal women are prone to night sweats.

However, there are also several other causes, including medical or medication causes so night sweats may warrant a medical checkup in some cases.

If you want objective information regarding the affect of increasing exercise intensity on the thyroid, see Neuroendocrinology Letters: Exercise Intensity and Its Effects on Thyroid Hormones referenced in this Livestrong article: Increased Exercise and Night Sweats

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