Home / Brands / Sleepon Product Description Advanced sleep tracker with Heart Rate, HRV & Blood Oxygen (SpO2). Go2sleep tracks SpO2-the level of oxygen in your blood-all night long in every second during your sleep. No other devices ever provide so much information as Go2sleep. Heart rate variability (HRV) is a measure of your autonomic nervous system that is widely considered one of the best objective metrics for physical fitness and determining your body’s readiness to perform. Vibrotactile fedback. When your heart rate and blood oxygen level is abnormal during sleep, vibrotactile feedback will alert you to prevent dangers. Add family members to the app and track their reports. Customer reviews No reviews left yet Write a review Most RecentTop Rated Delivery FREE UK Delivery via Royal Mail 48 HourRoyal Mail 24 UK �4.95International Tracked �12.50 DHL/UPS Worldwide Express �29.00 Customer Reviews Glo2sleep Advanced Sleeptracker ring £129.00