A Dedicated Sleep Tracker
A great way to use an Apple Watch is as an exclusive sleep tracker. Unfortunately, unless you have an Apple Watch Ultra, you’ll need to give your Apple Watch a few moments to charge during the day, which might make it hard to track your sleep at night.
Luckily, with a second Apple Watch, you don’t have to worry about not having enough battery. You can literally have one Apple Watch for the day and another one for your nights.
As long as you pair both Apple Watches to the same iPhone, you can switch between them and keep track of your vitals all day long without interruptions.