My daughter, when she sleeps, will be drenched in sweat with her hair matted to her face and head. She overheats very easily in the warm weather, so we dress her cool, play in the shade and supply plentiful water and popcicles. My son seems less affected. My husband struggles with even a mild temperature increase. I went so far as to have a heat stroke at age 5 when my parents took me to Florida and thought I was just whining too much about the heat. At the ER, my temp was over 105 (I usually run low, around 96.8 and often don't show actual fever, so this was especially severe) and before they got me stabilized I almost died.
As a child, I wondered at how kids wore turtlenecks and sweaters when I was heated up in a t-shirt. These days I am always freezing cold, have been through my later teens years onward. I don't handle anything below 50 or above 85-90 very well, but it's more the cold that will shut me down - cold HURTS.
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They tell me I think too much. I tell them they don't think enough.