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It seems you have a mold problem in the ducts.
There is services that will come out and clean your ducts. Call them and have them cleaned out . Then call your heating and cooliing company and have them checkout the AC unit to make sure it is in proper working order IE: its drianing properly of all of is condensed water, The condensor is not clogged with dirt, The filter is clean. Have them clean the condensor with a bleach mixture to get rid of any mildew/Mold that may be present.
An no there isn't a noctural mold. The reason you can smell it basicly after sundown is because before sundown your A/C is working the hardest. And all the condensed water now has reached a level that is getting the mold wet.
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