This is the category to be most sceptical about, and the one with the largest discounts — which is not a coincidence. Sleep tech is sold on the promise that measuring a problem will fix it. Measuring is not treatment, and for some people the measuring becomes the problem.
Part of our Black Friday sleep guide.
What a tracker is actually good at
Trends, not nights. A sleep tracker is reasonable at telling you that your average bedtime drifted an hour later across a month, and poor at telling you how much deep sleep you got on Tuesday. Treat the nightly stage breakdown as an estimate dressed up as a measurement, because that is what it is.
Our guide on whether you need a smart ring goes through what the consumer devices can and cannot detect. The short version: useful if you will act on a trend, actively harmful if a bad score ruins your morning.
Wake-up lights are the quiet winner
The one device category I would defend on evidence rather than enthusiasm. A light that brightens before your alarm works with the mechanism that already governs your waking, which is the same reason morning light matters so much in the first place. In a dark winter month, in a bedroom with no east-facing window, it is a reasonable substitute.
It will not, however, cure the habit of hitting the button — that is a different problem, and we have written about what actually happens when you snooze.
What to skip
Anything claiming to improve your sleep by sensing it. Under-mattress sensors that need a subscription. Apps that score your night and offer no action. And any device that requires you to look at a bright screen to check your score before bed, which undoes more than it measures.
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