Hello, I found a solution to return to normal regarding sleep tracking. My watch had the heart rate measurement that stopped during one night (for no reason) and therefore the sleep tracking did not work. I stopped/started the watch, the heart rate measurement resumed, but the sleep tracking still did not work. This lasted 3 days. Afterwards, I stopped/started the watch again then stopped/started the sleep tracking and on the start phase, I adjusted the related functions (sleep target duration, do not disturb duration, blood oxygen tracking on and HRV tracking on). Since then, sleep tracking has been working pretty well again. To be continued if this lasts over time. It remains to be understood why the Cardio measurement stopped during one night, which has happened twice since the last update.