How does Watch Generation 2 measure my sleep mode?

Based on your heart rate, blood pressure and motion, Watch Generation 2 will determine your sleep mode, specifying the percentage of deep and light sleep.

Watch Generation 2 can also monitor your REM Sleep time when the 24h Atrial Fibrillation (AFib) feature is on.

Please note:

The REM Sleep service is only available if you have an active monthly subscription.

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