The Sense is terrible at tracking sleep. It gives ridiculous times of 8 to 12 hours of sleep when I only slept about 5.5 hrs. Then it changes the data. It often gives an accurate reading and then when I sync the tracker the next morning it changes the amount of sleep to something totally ridiculous.
The heart rate monitor cannot figure out when I take off the watch and it records a HR (often a high rate) when I don't even have the thing on.
Never had these issues with previous models.
