I wish each point had a footnote pointing to a study. Most of these sound pretty reasonable, but I wonder if any are simply thought to be beneficial with no actual positive effect.
This is the podcast episode the graphic references. I think he references the studies in the podcast. Unfortunately it seems direct links aren't readily available on the show page.
Do not use a window for sunlight?! How else am I to obtain sunlight?
I'll add a very, very important thing. Use an app to kill the blue light coming off your screen(s). Notice how when you see a TV screen from the street or behind curtains it's always blue?
Notice how the dawn starts out bluish and dusk goes red? The blue light is energizing you, telling you to be awake.
The likely reason they say to not view through a window is because you won't get any vitamin D through a window and it also reduces the brightness compared to being outside. Get the app Lux on your phone which can measure brightness and it's a phenomenal difference how much brighter it is outside without really seeming like it
An interesting observation, but I track my sleep with a Garmin smartwatch.
I do have to wake up in the middle of the night to use the bathroom (not 1 or two hours, but 10 minutes tops), and my heart rate hits the nighttime low right after going back to sleep; my "body battery" ramps up after that point, too.
Anecdotally, this seems like a good thing to be happening.
I'd rather die than take a cold shower. Especially on a cold dark winter morning.
Those exercise hours sound bullshit. Especially because they are based on hours.
The best time I found to have caffeine is after working out at second breakfast. Exercise keeps you awake but the food and rest immediately after causes a crash. You ride through that crash with a coffee then you good for the say.
Multiple sleep patterns seems the most normal of all human sleeping types. The most abnormal is one big sleep (this is due to unnatural light).