It seems like the reason to buy an up3 would be for the purpose of sleep tracking. It doesn't seem like any other tracker is on par with it. The up3 will track

It seems like the reason to buy an up3 would be for the purpose of sleep tracking. It doesn't seem like any other tracker is on par with it. The up3 will track your heart rate through the night, and even has a flexible alarm setting to try to wake you in the lightest sleep phase. Does anyone know if there is a comparable sleep tracking device?