That's interesting to hear. I use my watch to track my sleep, I think I started doing that with the S6, but could have been as early as the S4, I'm not sure. I'm now using the S8. I've never felt like I had to charge my S6 or S8 twice a day to use it for sleep tracking. I charge my watch to 100% before going to bed, and it usually has around 30-20% battery left by the time I start thinking about charging it the next night. I do a 45 minute meditation workout and a 20-40 minute walking workout each day. I do have the AOD turned off. Can you tell what could be causing the difference in our experiences with the battery life?