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If you can keep an air space between the waterproof fly and the cotton wall, water vapor may pass through the cotton, allowing it to remain dry, to condense on the inside of the fly. If the two layers can't be kept separated; or, the cotton wall has been sealed for water repellency, ventilation will be necessary to keep condensation from accumulating inside.
As a rule of thumb, rely on properly rated sleeping bag and clothing layering systems for comfortable warmth while using the tent just for protection against the elements.
A semi-permeable (e.g. Gore-Tex) sleeping bag cover will help keep you and your sleeping bag dry, while increasing warmth, even in a wet tent and is something you might want to consider if you're often out in temperatures where condensation is a problem.
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