Anyone who says
Stage 5 of sleep, also known as REM (rapid eye movement) sleep, is marked by extensive physiological changes, such as accelerated respiration, increased brain activity, rapid eye movement, and muscle relaxation. People dream during REM sleep.
I'm hesitant to listen to or send money to, especially when they claim to be experts or in this case selling a product related to sleep cycles. You'd think they'd know: You dream during NREM as well. But, they only mention REM.
I'm also very wary of this product because all it says about how it works is
Because you wear SLEEPTRACKER® on your wrist like a watch, its internal sensors can detect even the most subtle physical signals from your body.
Gee, that's helpful.
If you decide to splurge, let me know how it goes. I wouldn't spend the money though, not unless you could find out if it actually has any way to sense anything more accurately and you can find actual details about it.
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