Sunrise alarms ranked by max lux at pillow distance and sunrise duration. Those are the two metrics that actually map to a wake-time phase shift.
Questions logged on this protocol
Does a sunrise alarm actually shift phase?
Modestly. Peak lux at pillow distance on the best models is ~300 lux, well below the 1,000-10,000 lux range where you see robust phase-shifting. Gabel et al. 2013 (Chronobiol Int) and Terman et al. 1989 showed dawn simulation improves wake-time alertness and cortisol awakening response. Pair a sunrise alarm with a 10,000 lux light therapy lamp during the first 30 minutes after wake for the full dose.
What should I actually look for?
Three specs in order: (1) max lux at your actual pillow distance, which is rarely published, so check for third-party measurements; (2) sunrise duration options, where 20-40 minutes matches the cortisol awakening response rise; (3) a true red-dominant sunset mode (warm, <2000K) for evening wind-down. Speakers, apps, and radios are nice-to-haves; the light metrics are the primary purchase criterion.
Hatch vs Philips, which should I buy?
Philips if peak lux and sunrise duration are the priority. Hatch if the app ecosystem, sleep sounds, and bedtime routine matter more and you are willing to trade some peak lux for UX. They are targeting different buyers. Hatch is closer to a lifestyle device with a sunrise feature; Philips is closer to a circadian device with some lifestyle features.
Will it wake me up without the audio alarm?
For many people, yes: dawn simulation alone produces a gentler wake in the last minutes of the gradient as light crosses threshold for EEG arousal. Budget units and heavy sleepers usually need the audio backup. Enable audio as insurance, set to a natural sound at low volume, not a buzzer.
Can I use it for shift work?
Yes, with timing inverted to match your schedule. For a night-shift worker sleeping 10:00-16:00, set the sunrise to begin at 15:30 and peak at 16:00. The circadian signal is the light gradient at wake time, not the clock time. Combine with blackout curtains for the sleep window and blue-blockers on the morning commute home.
Do I need one if I have east-facing windows?
Probably not in summer. Natural dawn delivers 1,000+ lux by civil twilight, much more than any alarm clock. In winter, or for sleepers whose habitual wake precedes sunrise by 30+ minutes, a sunrise alarm bridges the gap. The question is whether your wake time and your local sunrise align; if they do, windows win.
- [01]
- [02]
- [03]
- [04]
- [05]
Other stacks in this hub
Best Light Therapy Lamps 2026: Dose
Light therapy lamps ranked by measured lux at 12, 18, and 24 inch distances, not marketing claims. With $/measured-lux.
Best Blue
Ra Optics vs Swanwick vs TrueDark vs Bon Charge, tested for blue transmission percentage at specific wavelengths.
Magnesium Glycinate for Sleep: Protocol, Dose, Evidence
Lab-notebook protocol for magnesium glycinate as a sleep aid. The 200–400 mg evening dose, the Abbasi 2012 RCT, the glycinate-vs-citrate question, and the failure modes nobody surfaces.