Sleep

Why 670nm Is the Gold Standard Wavelength for Sleep Lighting
Most night lights labelled "red" use LEDs between 620nm and 630nm. But on the CIE melanopic action spectrum, 670nm carries roughly 21 times less melanopic weight than 630nm, giving you dramatically more headroom to use functional light at night without nudging your brain toward its daytime state. Here's why the specific wavelength on the spec sheet matters more than the colour you see. Read more...
Red Light vs White Light in Your Baby's Nursery: What the Science Says
Your phone torch is sabotaging your night feeds. Here's what the science says about red vs white light, why wavelength matters, and how to set up your nursery so you can actually get back to sleep. Read more...
What is melatonin, and what does it actually do?
Most of what you have read about melatonin treats it as a sleeping pill your body happens to make. That is the wrong mental model, and it leads people to the wrong fix. Read more...
What is red light, and is there any actual science behind it?
Red light sits next to a lot of overhyped wellness marketing, so scepticism is the right starting position. Here is what the research genuinely supports, what it only hints at, and what is being oversold. Read more...
Red light for recovery vs red light for sleep: what's the difference?
One costs several hundred pounds and you sit in front of it. One costs about the same as a takeaway and you barely look at it. Here is why the cheap one is not a watered-down version of the expensive one. Read more...
630nm vs 670nm: what's the difference for sleep?
One of those numbers is on almost every red night light box. The other is about twenty-one times quieter on the standard that measures this. Here is what the difference actually buys you at 3am. Read more...