@ADidier I totally see your point. However, I think sleep tracking is hard. It took Apple forever to roll this out and they have a huge user base. Clearly I think Apple leads the pack here. Suunto has a touch choice, either do what the market demands or lose sales. I would rather a company, any company get it right maybe with less features so no deep, REM and light but absolutely accurate sleep times. I agree with you, I would use that if I knew it was always correct.