A:AnswerI don't think it does I have not used it for sleep I wear a cpap mask and have had sleep studies testing my oxygen level at night so I don't need that function
A:AnswerNo gps. Never used it but I believe it can use your phones gps to do certain functions. Yea on daylight saving. I believe a lot of this is done based on your phone.
A:AnswerIf your Fitbit is waterproof, then you're fine to wear it for water aerobics or while taking a shower etc. If it's not. Don't do it. You will mess it up. The wife and I just returned ours for upgrade and found out they do not offer warranties anymore. This sucks! As we did have a few issues with a couple not charging and was able to exchange. Now, we would have to buy another if a serious problem happened. But for the most part, the Fitbit's last long... in my experience.
A:AnswerIf it's possible it should be done through the app. But I believe it's based on weight & height and the calories you burn and the amount of your activities.