I'm almost positive that's bullshit because I spent half of my life as a "night owl", convinced it was just something inherent to me. After my wife took a job t

I'm almost positive that's bullshit because I spent half of my life as a "night owl", convinced it was just something inherent to me. After my wife took a job that had her waking up at 4am, and the requisite adjustments to her bedtime, I found myself totally fine with going to sleep at 10am or earlier everyday. In a lot of ways an early bedtime, or an average bedtime, is preferable to staying up to the wee hours, but given the context I couldn't see the benefits until I had experienced it myself for a few months. So in my opinion, if there is some kind of genetic marker for chronatype, it's either not very influential, only expressed in a subset of the populace or largely BS.