How to Time Light for Optimal Sleep & Wakefulness | Samer Hattar & Andrew Huberman

Does it ? Let's say somebody is in a condition where there's a lot of cloud cover , is it important to get outside ? So I have to tell you the cloudiest day is going to be much more brighter than your room .

How to Time Light for Optimal Sleep & Wakefulness | Samer Hattar & Andrew Huberman

So if it's very bright , you don't need a lot because it's clearly gonna make you fire like crazy . But if it's not bright , stay longer , stay for one hour , you know , have your coffee outside or something like that , it's just gonna help . I think you said something extremely important , which is that this circadian system is trying to figure out when you are in time .

How to Time Light for Optimal Sleep & Wakefulness | Samer Hattar & Andrew Huberman

You could do this for your skin and , and you know , protect your skin . That's not my area of expertise but for , for that effect on the circadian system , as long as you're outside in the shade and a sunny day , 10 to 15 minutes should be ample amount . Ok .

How to Time Light for Optimal Sleep & Wakefulness | Samer Hattar & Andrew Huberman

It depends of how , you know , how thick the windows are and how dark they are . So it's , but it's also nice to go outside and to feel the season sunglasses off . I don't use sunglasses , but you have the Jordanian photo pigment , you know .

How to Time Light for Optimal Sleep & Wakefulness | Samer Hattar & Andrew Huberman

Ok . So then , and , and the other thing that I would like to mention to people , if , if you think it's very dim outside , let's say it's very cloudy , stay longer . So remember , intensity is only one component duration is also important because remember that the circadian system , it's not like the image system in the image system , you have to change every second because you're looking at different objects , you have to change your perception .