This watch isn’t as what I’ve expected; i thought I can buy it to track my sleep but unfortunately it is very very very behind it’s development; I would say it’s a regret buying it. The watch doesn’t have a good sense of logic doing sleep tracking; How can you start tracking a sleep when there isn’t any heart rate? When you woke up during midnight for a toilet break or take a sip of water, the watch detected much of your movement and will stop tracking your sleep and some how declared that you are awake and you get a bad sleep recorded for that night. It’s purely an expensive inaccurate watch.