SlashGear offers an in-depth review of ResMed’s S+ consumer sleep tracker, including its features, pros, and cons.

Your bedroom companion doesn’t even get the benefit of some data of their own. Not only can the S+ only track a single person at a time, you can’t have a second unit working simultaneously on the other side of the bed. That’s a technical limitation of ResMed’s sensor – one the company tells me it’s confident it can overcome, though it may take a couple of years – and on the plus side the S+ is easily re-paired with a second device (and account), so you could feasibly take it in turns to log data.