Sleep Cycle App Review: Apple Watch Science Test – YouTube

Sleep Cycle App Review: Apple Watch Science Test


  • Video Views: 162781
  • Published On: 2021-01-02 20:15:01
  • Video Published/Author: The Quantified Scientist
  • Video Duration: 00:10:55
  • Source: Watch on YouTube

I tested the sleep tracking of the Sleep Cycle App on my Apple Watch Series 6 against a scientific EEG device. For updates subscribe to my weekly Newsletter(!) on
Twitter: @QuantifiedRob

👇Amazon Affiliate* (paid) links. Supports the channel, doesn’t cost you any more!👇
Apple Watch 44mm:
Apple Watch 40mm:

*My opinions are completely my own. However, I do earn a small commission if you purchase any of these devices via my affiliate links. It does not cost you any more money if you use these links.

The EEG tracker I used is called the Hypnodyne ZMax: from @HypnoDyne Corp

📹Apple watch videos📹

📹First Garmin Venu Sq Video📹

📹Oura Ring videos📹
Sleep Test:
HRV Test:
Temperature Test:

📹Fitbit Sense videos📹
First look review and test:
Heart rate:

📹Withings Scanwatch videos📹
Unboxing and first review:
Sleep test:
Heart rate test:
Q&A with Withings:

⏱️This comparison is part of a larger project where I spend over 11 hours a week tracking everything in my life. If you’d like to know more: ⏱️

00:00 Intro
00:50 Sleep Cycle App Intro
02:06 Sleep Test Setup Explained
03:20 Results: Main Results
07:03 Results: Overview Analysis
08:08 Result Interpretation

(1) Not Without the Rest by Twin Musicom is licensed under a Creative Commons Attribution license (
(2) Wonders by JVNA
(3) Can’t Sleep (YouTube Audio Library)
(4) Classique (YouTube Audio Library)
(5) Blurry Vision (YouTube Audio Library)


  1. Hey Rob, I am hoping you would revisit the experiment with sleep cycle app but without an apple watch connected, just purely from the phone's sensor. Been using the app for a year and would love to see if the readings are anywhere near accurate. Thanks!

  2. I also have a scientific background and I’m just amazed at the quality of this video. This was done with better methods than many scientific articles! And a discussion about limitations and future avenues at the end?!? A-MA-ZING!

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