These are the important metrics to pay attention to on your sleep tracker instead of total sleep time

These are the important metrics to pay attention to on your sleep tracker, instead of total sleep time, because, according to experts, the ‘hours slept’ number can be a total tease.

You can hit a solid eight hours and still feel like you’re running on fumes.

That is because your body cares about how your sleep is built, not just how long you stay horizontal.

If your night is chopped up or you miss key stages, you can wake up groggy even with a respectable sleep total.

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Pay attention to your sleep tracker

Your Apple Watch has the potential to be the gadget that can save your sleep schedule, but you need to use these overnight hacks to get the most out of your Apple Watch.

Let’s start with deep sleep, the stage that does the heavy lifting when it comes to physical repair and brain cleanup.

Deep sleep tends to stack up in the first half of the night, so staying up super late can mean you do not just ‘shift’ sleep, you actually miss a chunk of the deep sleep window.

And here is the sneaky part: it is not only the number of minutes that matters, but it is also the stability.

Experts describe high-quality deep sleep as slow wave activity happening in sustained, continuous “trains,” because stop-start deep sleep can feel less restorative even if your tracker says the minutes look normal.

Deep sleep is also when your brain gets its overnight rinse.

During deep slow-wave sleep, brain cells shrink and fluid moves through to flush out metabolic waste, including beta amyloid, which researchers link with Alzheimer’s disease.

It’s a bit like your phone waiting to be plugged in before it starts backing up.

Your brain basically runs a tiny pressure wash while you are off dreaming about winning the lottery.

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Instead of total sleep time, focus on deep sleep and REM metrics

Next up: REM sleep, the stage tied to creativity, memory, and emotional regulation.

REM is heavily guided by your circadian rhythm and tends to concentrate in the second half of the night.

That means chopping off even 30 to 45 minutes with an early alarm can steal a disproportionate amount of REM, which helps explain the groggy mornings.

Want to nudge both of these important metrics in the right direction?

Get 15 minutes of outdoor light within an hour of waking, keep your bedroom cool (around 60 to 67°F), and go to bed and wake up at consistent times so your body knows exactly when to power up sleep mode, just like you would do with your phone.

Focus less on the minutes that come up on your sleep tracker that tell you how long you have slept, but pay attention to the important metrics, the deep sleep parts of your night, as well as your sleep quality score.

Sweet dreams!

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