Who knew these sleepy babies could have such an affect on dads. A new study on 362 dads in the Philippines claims that men who sleep in close proximity to their kids experience temporary decreases in testosterone.



During the four-year study, researchers found that fathers who slept next to or in the same room as their kids temporarily had lower levels of testosterone than fathers who slept in separate rooms. The testosterone levels would only return to normal once fathers woke up.

On an evolutionary perspective, it might seem that these men's bodies were making adjustments just the same as women's bodies in order to better adapt to child rearing. Study researcher Lee Gettler from the University of Notre Dame notes that the study "suggests to us that active fatherhood has a deep history in the human species and our ancestors."

via Livescience