This is a long time ago and I doubt anyone will get use out of this but that extra smelly nightsweat rancid sweat smell is definitely a bacteria/yeast.
I know this as I have PCOS and my hormones and insulin are f****d, anyway, this will help like overnight and it's nontoxic.
So take a fresh cotton pad or ball soak it in Bragg's apple cider vinegar with the mother (Bragg's is best as it contains the mother and is cold pressed) shake the bottle up, dab some on the cotton ball or pad and then rub it where the smells are coming from. Such anywhere that there's folds, like the neck, under the boobs, the pits, the feet, the stomach rolls, the lower abdomen and inside elbows. This may burn or if you have sensitive skin dilute 2 pts water to 1 pt ACV.
***Note this should not be applied like this in genital areas there's an alternative method to this I'll discuss after**
If you find ur genitalia or belly button smells run a bath or bucmet pour 1/2 a c. Of the apple c. Vinegar into the Bagh and bucket and bathe the affected area this should not sting, if it does please water it down. I do this when my hormones are off and .y sweat smells bad, it works a miracle! Do this as needed no more than once a day. Best of luck! -Oscar