My wife wants a sleep tracker for Christmas and I have no experience with them. From what I can tell, there are three choices: something for the wrist like a Fitbit, something for the mattress like an Apple Beddit, and an O2 sensor for your thumb. She was unsure about the Fitbit because the reviews are mixed. She doesn't care about recording steps during the day.
I'm starting to research them but I had never heard of a Beddit. It's a strip that goes under the sheets that can measure breathing rate, heart rate, snoring, time spent sleeping, etc. Nokia has a competitor I haven't had time to check out.
And then there's this. It gets better reviews than all of them because it measures blood oxygen level but it looks uncomfortable. Any experience with these things?