sleep-trackers
Apple Watch Series 9
The Apple Watch Series 9 features some of the most accurate heart rate and motion sensors on the market. Its sleep stage tracking has been rigorously validated against PSG, often outperforming dedicated sleep trackers in identifying Deep and REM cycles.
Quality & Materials
Available in 100% recycled aluminum or stainless steel. The back crystal is sapphire or ion-X glass, ensuring high-quality sensor transmission.
Evidence & Testing
Apple's sleep tracking validation study involved over 1,000 participants and demonstrated high sensitivity in detecting sleep stages compared to clinical PSG.
Brand Transparency
Apple publishes detailed 'Healthcare' white papers explaining the methodology and clinical validation behind their heart and sleep algorithms.
Value Assessment
High upfront cost ($399), but no mandatory monthly subscription to access your data, which gives it better long-term value than Whoop or Oura.
Why Not Alternatives?
The Apple Watch offers superior sensor accuracy compared to Fitbit or Garmin for sleep staging. While battery life is shorter than Oura, the breadth of health metrics (ECG, Blood Oxygen, AFib history) is unmatched.
Sources & References
More in Sleep
Avocado
Green Mattress
GOTS, GOLS, Made Safe, and GreenGuard Gold certified. Owns supply chain. 92% of synthetic mattresses contain flame retardants linked to endocrine disruption.
Thorne
Magnesium Bisglycinate
Bisglycinate form is highly bioavailable and doesn't cause GI issues. Glycine itself promotes relaxation. NSF Certified for Sport.
Savvy Rest
Shredded Latex Pillow
The Savvy Rest Shredded Latex pillow is the gold standard for material purity, using GOLS-certified organic latex and GOTS-certified organic cotton. Its shredded format allows for complete customization of loft, which is essential for proper spinal alignment across different sleeping positions.
Avocado
Avocado Green Pillow
This pillow is one of the few on the market to achieve MADE SAFE certification, ensuring it is free from over 6,500 known toxins. It combines organic latex with organic kapok fiber for a feel that mimics down without the allergens or ethical concerns.