I love my Apple Watch for tracking my sleep. I actually made a switch in January - I used to drink about 20 oz of coffee every morning out of routine. I wanted to add more protein to my routine so now I make my self an iced protein drink that is my 12 oz protein shake (30 G protein) and top off with only about 6-8 oz of coffee every morning. I do drink fresh brewed black tea every afternoon as well, but my caffeine intake is significantly reduced. It’s probably a combination of less caffeine and also now working out that my sleep has improved. I used to have to take melatonin or prescription sleep aid frequently, and have barely needed to in January and February. I even scored a 99 sleep score Sunday night!!!