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REM Sleep Not Registering

I just got an Instinct Solar Tactical for a few days. I noticed that my watch didn't record REM sleep (For 4 days).

Only Deep sleep, Light sleep and Awake are tracking.

Is this function is enabling ? or just because I didn't have REM during my sleep ?

When I go on the Help page.

Is this normal ? 

[Software Version 15.10]