The Best Sleep Tracking Watch

From step counting to AI-generated energy scores

Modern smartwatches are no longer limited to activity tracking or notification display. In 2025, the key technological battle is focused on analyzing sleep quality. The latest features, such as sleep apnea detection, heart rate variability (HRV) monitoring, and AI-generated „energy scores,” allow users to gain a more accurate understanding of their nightly rest. As a result, watches have become an essential tool for both daily well-being monitoring and long-term health planning.

From simple hours to detailed phase analysis

Previously, sleep data was minimal — just total time. Now, with advanced accelerometers, PPG sensors, and blood oxygen level (SpO2) monitoring, various sleep phases can be identified:

• REM Sleep: crucial for memory and emotional health.
• Deep Sleep: essential for physical recovery.
• HRV (Heart Rate Variability): indicates the nervous system’s recovery after stress.

However, not all devices offer the same accuracy. Below are the leaders of 2025.

An unbeatable choice for iPhone users

Independent studies, such as those by The Quantified Scientist, cite Apple algorithms as highly accurate in distinguishing sleep phases compared to medical polysomnography equipment.

• What it does best: accurately differentiates true sleep from wakefulness, reducing the likelihood of false data.
• Innovations: watchOS 11/12 with the Vitals app provides a comprehensive overview of nightly health, alerting users to deviations in respiratory rate or wrist temperature.
• Cons: battery life — typically requires daily charging.

Verdict: ideal for those seeking maximum data accuracy and who are already in the Apple ecosystem.

Special focus on respiratory health for Android users

The FDA-approved sleep apnea detection feature allows monitoring of breathing disorders and snoring.

• AI Integration: Energy Score combines sleep quality, activity, and heart rate into one easy-to-understand score.
• BioActive Sensor: more accurate SpO2 measurement during sleep.
• Cons: battery life in the standard model is about 1-2 days.

Verdict: perfect for Android users concerned about breathing disorders or snoring.

Longest battery life and reliable sleep analysis

The Body Battery feature shows the body’s recovery level in real-time.

• Sleep Coach: recommends optimal sleep times based on daily load.
• Battery: up to 14 days, ideal for trips without a charger.
• Cons: sleep phase accuracy is slightly lower than that of Apple or Fitbit algorithms.

Verdict: great for athletes and those who want to „set it and forget it.”

Sleek design with in-depth sleep data

Premium features allow assigning a „sleep animal” based on monthly habits, providing interesting visualization and motivation.

• Comfort: round design is comfortable at night, less intrusive than a square watch.
• Daily Readiness: integrates sleep data into recommendations for exercise or rest.

Verdict: for those seeking a balance between functionality and comfortable sleep analysis.

An alternative for those who find watches uncomfortable at night

A new trend cannot go unmentioned — rings that are almost unnoticeable during sleep.

• More accurate finger vascular measurements (heart rate, temperature).
• Can be used with a watch during the day or as a standalone night device.

How to choose the best device

1. Medical-grade accuracy for iPhone users: Apple Watch Series 10.
2. Battery and sports: Garmin Venu 3.
3. Suspected sleep disorders and Android: Samsung Galaxy Watch 7 with apnea detection.
4. Comfort and simplicity: Google Pixel Watch 3 or Oura ring.

Expert Tip: consistency is key. A watch or ring won’t work miracles, but it will provide data to help improve sleep habits, limit evening alcohol, and get more rest.