Sleep masks

Contemplating buying a sleep mask that detects REM sleep and lights up to notify the dreamer about it.

Recommendations? Pros/cons? Personal stories?

PS I apologize if a similar question was posted some place else on this forum. Feel free to refer me to that thread if it exists.

:pray:

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Certainly a reasonable question. See this, and this one, and this one too.

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Thank you very much!