For all of their integrated training and health monitoring features, Apple Watch can't measure your sleep outside of the box. It can be changed next year, according to a new report Tuesday.
Bloomberg's Mark Gurman reports that Apple is currently testing a sleep monitor for a future version of Apple Watch.
The company has been using the sleep-tracking feature for several months with testers in secret locations around its Cupertino, California headquarters.
If functionality is successful at the testing stages, the company plans to add it to Apple Watch by 2020, according to people familiar with the work.
The report does not make clear whether Apple's implementation of "a sleep monitor" may require new sensors, or if this is something that can be brought to older models through a firmware update.
For comparison, Fitbit and many other training tracks incorporating sleep monitoring features use a hearing frequency sensor and other sensors to measure data such as when a user falls asleep, how long they sleep and the quality of sleep.  The healthcare system is already sports sections dedicated to sleep analysis.
There are many third-party watchOS apps on the App Store focused on providing sleep analysis based on data from the device's built-in sensors.
Most of these apps write data to the health program.
The health department has from the beginning included a section for sleep analysis data. Apart from third-party apps, the Healthcare Agency can also retrieve sleepless information from third-party sleep monitors and the alarm clock feature of the iOS Clock app (time-sleep data).
There is only one problem: battery power.
A practical necessity for sleep tracking in a smartwatch is a battery that can last for several days. Every Apple Watch model of the day is announced as being able to last a day with the need to charge it every night. For comparison, Fitbits sleep watch watches are marketed so they can last as long as a week on a charge.
Here we go again and compare the battery life of training tracks to a general smartwatch like the Apple Watch that does so much more than tracking the workouts.
Some choices may include Apple that increases the battery life of the watches or provides a way to run night tracking as part of a low voltage mode. It can also only require a battery charge in the morning.
So I've been using apps like Sleep ++ and AutoSleep for many years now to measure the duration and quality of my sleep. Yes, that means I don't usually wake up to a fully charged device that I would have had, I left my watch on the charger overnight.
No, this is not a big deal for me – far from it. There are worse things in life than waking up to a half-charged clock. Besides, I just leave my watch when I do my morning routine. When I'm done and ready to jump out, I'm usually almost 100 percent charged.
That's good enough for me.
There is no technical reason to bring sleep analysis to older watches with a software update. Apple is Apple, it may choose to limit such a feature to 2020 units to increase sales. Another reason may be to avoid dealing with customers who can complain about their batteries on their batteries, and thus lose the battery due to a battery-sucking function such as sleep detection.
TUTORIAL: How to track your sleep with AutoSleep
Then again, many people who track their sleep with third-party applications do not complain about any battery issues, and Apple probably does not deny the service to those people just because they accidentally use a battery sleep tracking app.  thoughts?