Michael Herf – Medium

Michael Herf

Why early birds stay up late and night owls wake up early

Your circadian system wants to wake up at a certain solar time.

6 min readMar 12, 2023

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Michael Herf

Stopping the Superspreader

The case now for air quality & taming the most risky spaces

5 min readJul 22, 2022

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Image copyright The Associated Press

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Michael Herf

CO₂ sensors are magic COVID finders

Recently, I wrote about practical ways to ventilate for COVID-19, and why this is important. The idea from medical facilities and building…

2 min readDec 18, 2020

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Michael Herf

How to Ventilate for COVID-19

Since the pandemic started, making buildings safe means keeping the air free of viral particles. This article addresses how much…

5 min readAug 4, 2020

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Michael Herf

Some notes on “far UV-C” light

Can we use a new kind of UV-C light in occupied spaces?

3 min readJun 25, 2020

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Michael Herf

Position Letter to the California Senate: AB-7, permanent Daylight Saving Time

June 3, 2019

3 min readJun 13, 2019

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Michael Herf

Why Standard Time is better

We have to stop changing the clocks twice a year, but it’s also important to pick the right schedule when we do it.

17 min readMar 20, 2019

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Why Standard Time is better

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Michael Herf

Circadian Reality

VR glasses are going to affect sleep like nothing we’ve ever seen

3 min readOct 7, 2015

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Circadian Reality

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Michael Herf

On Really Bright Screens

They’re good for more than the movies

2 min readJan 14, 2014

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Michael Herf

Michael Herf

co-founder of f.lux, finding the connections between circadian rhythms, sleep, healthy buildings, and light. (Previously made Picasa.)

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