Horizn · Guides
Light, sleep, and waking well.
Practical, no-hype answers to the questions we kept asking while building a sunrise alarm. Written by the person who wakes up to one every morning.
How to Wake Up When It's Dark Outside
Dark mornings feel brutal because sunlight arrives after your alarm. What helps: a consistent wake time, immediate light, and a gradual dawn before you wake.
Read the guide → August 10, 2026Sunrise Alarm Without an App or Subscription
What a sunrise alarm actually needs the internet for (just time sync), what cloud dependence costs you, and a checklist for buying one that works offline.
Read the guide → August 3, 2026DIY Sunrise Alarm: ESP32 + LED Strip Lessons
What I learned building a DIY sunrise alarm with an ESP32 and SK6812 LED strip: gamma correction, perceptual fade curves, real dawn colors, and reliability.
Read the guide → July 31, 2026Inside the Engine That Wakes Me at 4:34
A progress update from the Horizn build: the sunrise you see on the wall, and the self-healing engine underneath that treats one missed alarm as an emergency.
Read the guide → July 27, 2026How Bright Should a Sunrise Alarm Be? Lux Explained
Aim for roughly 250-300 lux at your pillow, not the number on the box. How distance, room geometry, and gamma correction decide whether a sunrise alarm works.
Read the guide → July 27, 2026How to Choose a Sunrise Alarm Clock: 5 Criteria
The five specs that matter in a sunrise alarm, brightness at your pillow, ramp quality, app lock-in, outages, longevity, from a builder who owns the top pick.
Read the guide → July 19, 2026Do Sunrise Alarm Clocks Actually Work?
An honest look at what dawn-simulation research supports, what sunrise alarms can't fix, and the mechanics that separate a good sunrise from a bad one.
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