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2 comments
A decent night's sleep is nature's secret weapon. However a monitor is most certainly a snake oil purchase 'cos, amongst other things, information isn't the same as knowledge. If you're desperate to spend some money to improve your performance you can't do much better than spending £9.99 on a copy of Christie Aschwanden's excellent book 'Good to Go'.
Snake oil!
It is possible under laboratory conditions to monitor sleeping states accurately.
Anything you wear on your wrist will be so far out as to be worthless in the information it gives you.