The ground gives off moisture, people give of moisture - and it all goes up.
The inside of your fly becomes wet where it all condenses, the moisture can't get out - so rig your fly so it can.
Those nice little enclosed set-ups are great - but wet, wet, wet. Get them off the ground and open an airway to get circulation ............. and I could go on and on .......
And the others are right - it's probably a breeze, or better ventilation, or the 'hand of God' ....... the world is a strange place.
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