It's true and bs at the same time
I'm a night owl, as you can tell from the time I am posting this, despite having to be at work at 9am. However, saying you are a natural night owl isn't true, the body is designed to sleep during the night and I always do when I go Yurting. There's no electricity, so no computers, ebooks etc.
It's technology that keeps us up, throw work/uni etc into the mix too.
I'd advise that everyone goes away yurting at least once, somewhere with no power. You turn off the phone, no social media, forums etc. Takes you back to nature