Earlier Light, Lighter You!

Another reason to get up and out. Northwestern researchers strapped wrist monitors on 54 adults for a week, tracking exactly when their light exposure happened and how it lined up with body mass index. The people whose brightest light hit earlier in the day — even just moderately bright, more overcast afternoon than blazing sun — had meaningfully lower BMIs than those who got the same light later. For every hour that window drifted later in the day, BMI ticked up, and the effect held even after accounting for sleep, activity, and what people ate. So yes, its about avoiding  nightlight, but even more important is catching real light earlier. The take-home: that morning walk may be doing more for your waistline than the evening one. Read the study here.

Why you may want to think twice before tracking your sleep

Sleep is important, but sleep tracking may be messing with you. Students were told they were having their sleep measured. Half were told they'd had great REM sleep, half were told theirs was below average — but it was all made up. The students who were told they'd slept poorly actually performed worse the next day on tests of attention and processing speed, even though their real sleep might have been fantastic. Turns out your brain will believe almost anything you tell it — even a made-up number on a screen. Worth keeping in mind next time your tracker greets you with a low score before you've even had coffee. This kind of number-chasing has an actual name now: orthosomnia, a real and growing anxiety around getting "perfect" sleep data. Bottom line: sleep still matters enormously, but one rough night isn't the crisis your tracker wants you to believe it is. (Thanks to Max Lugavere for sending this one my way.) Read the study here.

No Selling! I want to build something with you — and it starts with 5 questions.

I've been thinking about this newsletter as more than just something you read — I want it to be a place, a community of people who actually talk to each other, not just scroll past another email. But I don't want to guess what that looks like. I want to build it around what you actually want. So I put together a genuinely short, completely anonymous survey — five questions, maybe two minutes, no email required, no catch. I'm not selling anything here. I just want to know what would make this worth showing up for, and the only way I get that right is if enough of you tell me. If you've ever wished this newsletter felt less like a broadcast and more like a conversation, this is your chance to help shape that. Take the 5-question survey here — I read every response.

Sending you early sun and sweet dreams!

Kerstin

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