Purchased the Spark 3 Cardio at the weekend and the sleep monitor seems to be very flaky. Over six nights it has only recorded sleep for three and on one of those nights it only recorded half the night as I got up to use the bathroom in the early hours and it decided that was when my sleep finished. So it currently has less the 50% success rate on monitoring my sleep.
Is anyone else using this device to monitor their sleep and if so are they having more luck than I am? Is there anything I can do to maybe calibrate the device to work better?