Circadian clock entrainment can be achieved solely through morning sunlight exposure.

“Once you get into a rhythm, and I don't mean it as a pun, in reality, once you get into a rhythm, it's hard to break out of that rhythm because if you start sleeping late and waking up late, you're not getting the morning sunlight.”

“For the clock, for entraining your clock, you literally can entrain it only by the dawn sunlight. You actually don't need dawn and dusk.”

“that's what happens when you look at morning sunlight you're advancing your circadian clock translate to English or non- nerd speak you're making it such that you will want to go to bed a little bit earlier and wake up a little bit earlier the next day”

“that's what happens when you look at morning sunlight you're advancing your circadian clock translate to English or non- nerd speake you're making it such that you will want to go to bed a little bit earlier and wake up a little bit earlier the next day”