And BTW, this condition is not limited to outdoor or hot weather exercise.

There have been cases in the UK of people in nightclubs taking illegal drugs that tend to cause dehydration which is of course dangerous.
Advice was therefore given that users of such drugs should "drink plenty of water" some users took this to extremes and drank so much water that water intoxication resulted.

The symptoms could somewhat resemble those of drunkeness or recreational drug use, and might therefore delay proper treatment.