Living Light Metabolic CoachLiving Light Metabolic Coach

Most people focus on supplements, diets, routines…but ignore the most important thing — their be

1 Jul 2026 · 2 min

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1:49

In this short dialogue, Speaker A asks about bedroom environmental factors that affect sleep, specifically light exposure, screen use, and temperature, noting modern light pollution and the role of temperature in circadian biology. Speaker B, acting as the expert, explains that body temperature naturally rises sharply upon waking, signaling alertness, and that activities like exercise or cold plunging in the morning amplify this beneficial rise. Conversely, any activity that raises body temperature at night—such as eating, exercising, or cold plunging—disrupts the natural nighttime temperature drop and harms sleep. The expert stresses the importance of a cool bedroom that allows the body’s temperature to fall, warning against constant heating. Additionally, the bedroom should be “cave‑like”: completely dark with minimal artificial light, as even low‑level light at night can disturb circadian rhythms and hormone production. Finally, the expert notes that eyes are “light‑hungry” in the morning, implying the need for bright light exposure after waking to reinforce the circadian cycle.

Chapters

How about the bedroom? I know light even creeping into the bedroom can be a problem. So maybe talk about that because some people might live in cities and I know that, you know, obviously, no, try not to have screens in the bedroom, maybe phone on airplane mode somewhere accessible but safe, safely away from your body. But like there's a lot of light pollution these days. So maybe just touching on that a little bit. And you mentioned temperature, so maybe you can talk about that too, because there is a natural drop in our temperature that I believe is regulated by our circadian biology, if I'm not mistaken.
Yes, that's an excellent point. So the moment we wake up first thing in the morning, there's a sharp rise in our, in our body temperature, and that signals wakefulness. So any activities that we do in the morning that increase the sharpness of that rise in body temperature, such as exercise or cold plunging, is working with our circadian biology. On the other side, it's really bad to do anything at night that will cause that increase in body temperature, like eating food, cold plunging, exercising. Now, another important aspect is you want to make sure that your bedroom is allowing for that natural drop in temperature to occur. So if you're in regulated temperature all of the time, and you're blasting the heaters at night when you're sleeping, that disrupts your circadian biology and disrupts your sleep. Also, it's absolutely necessary that you make your bedroom similar to a cave because any form of artificial light and very little amount at night profoundly disrupts our circadian biology and our hormones. And one thing about our eyes, our eyes are light-hungry first thing in the morning.