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Parents also tend to gain weight, and higher BMI is associated with a decline in T.

https://pmc.ncbi.nlm.nih.gov/articles/PMC3809034/

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Several of the studies described changes in hormones before the child was born.
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Extra time commitment, and therefor missing some sleep, can start before the baby is born.
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If you cosleep with your 8 month pregnant wife she might not be sleeping well and by proximity you may not be sleeping well.
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