I was sitting on a chair and it recognized I was sleeping. Any other app I tested never misunderstood that becaus my heart rate dropped sharply when I really fell asleep. This app's analysis quality is nothing but a middle-schooler's vacation science report...
While we are always trying to improve the accuracy of the algorithm, sometimes the watch does not accurately pick up your movement overnight, which means that the data you receive will not be completely reflective (e.g. says you were asleep when you were awake and vice versa). I'm sorry about that! There is a way to edit your data in the app if this happens.