
Apple in 2017 purchased Beddit, a company that makes a sleep monitoring system designed to track your sleeping habits to help you improve your sleep hygiene.
Apple hasn't said much about the purchase, nor what it's doing with the data it collects from the Beddit system, but in December, Apple quietly pulled the original Beddit Sleep System and introduced a redesigned model with an updated and revised feature set.

There have been quite a few complaints about the new 3.5 version of the Beddit Sleep Monitor (and its accompanying app) because it removes some functionality that was available with the first model Apple offered. I've been using the original Beddit since 2017, so I decided to check out the new model to see how it compares.
As it turns out, the complaints about removed features are valid, but the improvements introduced in the updated version shouldn't be overlooked.
Design
The 3.5 version of the Beddit Sleep Monitor is similar in design to the previous models, consisting of a fabric-covered strip outfitted with a number of sensors designed to track movement, heart rate, and other parameters that can impact sleep.

Measuring in at 2.5 inches wide by 30 inches long and 2mm thick, the Beddit Sleep Monitor is meant to be placed on top of a mattress right about where your heart is located when you sleep.

The idea is to put the fitted sheet over the sensor once it's been placed across a mattress. You need to make sure nothing else is over it like another blanket or a pillow -- sheet only between the sensor and your body.

On one side of the Beddit, there's a USB cord that plugs into a small 5W iPhone-style power adapter, and underneath, there's a rubber-like material meant to keep the Beddit from slipping and sliding. The older model used something similar, but the new one uses a sturdier, more rigid material.
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Article Link: Review: Apple's Beddit 3.5 Sleep Monitor Loses Features, but Gains Accuracy