I snore and have had sleepng issues for years. I was recently diagnosed recently mild sleep apnea and low blood oxygen levels (<90%) through a sleep study. I decied to try the mouth piece to see if it helped with my symptoms and used the SleepOn ring to monitor my improvement. I will say I was skeptical. The mouth piece is not very comfortable, but suprisingly, after a few nights, I became more used it. I will pursue a custom sleep appliance from a dentist for a more comfortable fit. My snoring stopped the first night and has not returned in the 2 weks, and I am sleeping more soundly. The ring indicates that my ODI is in normal range. I was unaware of this term vs the more common used AHI. ODI is an indicator of frequency and severity of oxygen level drops during sleep ODi is used with AHI to determine severity of sleep apnea. This was a suprising and relatively inexpensive solution to improve the quality of my sleep! Thank you!