Topic
Light and Circadian Rhythm
How light sets your body clock, and how to use morning light, dim evenings, and a gentle wake light to fall asleep and wake up on your terms.
13 articles
How Light Controls Your Body Clock
Light is the strongest signal your internal clock uses to keep time. Here is how it works and how to use it on purpose.
Morning Light and Why It Sets Your Whole Day
The light you get in the first hour after waking shapes your alertness now and your sleep tonight. Here is how to use it.
Blue Light at Night: What It Does to Your Sleep
Blue light at night confuses your clock and delays the hormone that brings on sleep. Here is what actually helps.
What a Sunrise Alarm Does That a Normal Alarm Cannot
A sunrise alarm wakes you through light rather than shock. Here is why that changes how you feel in the first minutes of the day.
How to Fix a Delayed Sleep Schedule With Light
If you fall asleep too late and struggle to wake, light timing is the strongest lever you have. Here is how to shift earlier.
Why Dim Evenings Help You Fall Asleep Faster
Dimming the lights before bed is one of the simplest sleep changes you can make. Here is the biology behind why it works.
The Best Light Setup for a Calming Bedroom
Bedroom lighting affects how easily you fall asleep and how rested you wake. Here is how to set it up well.
Melatonin, Light, and the Timing of Sleep
Melatonin is your body's night signal, and light controls when it arrives. Understanding the link explains a lot about sleep.
How Seasonal Light Changes Affect Your Sleep
Shorter winter days and long summer evenings both pull on your sleep. Here is why, and how to steady your rhythm year round.
How Shift Workers Can Manage Light Exposure
Shift work fights your body clock, but careful light timing can soften the blow. Here is a practical approach.
Screens Before Bed: Practical Limits That Actually Work
Cutting out all screens at night is unrealistic for most people. Here are limits that respect real life and still help.
Why Waking to Gradual Light Feels Gentler
Waking to slowly rising light feels softer than a buzzer, and there is a real reason for that in how sleep works.
Light Therapy Basics for Better Mornings
Light therapy means using bright light at the right time to set your clock. Here are the basics for using it well.
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