i've been using the Oura Ring to enhance my sleep, and it's been remarkably effective. Despite consistently getting a minimum of seven hours of sleep, I occasionally find that my deep and REM sleep aren't as optimal as I'd expect. Given my lifestyle changes, such as abstaining from alcohol since January 1st, regular exercise five times a week, and maintaining a balanced diet resulting in a weight loss of over 20 pounds since last year, why might this be occurring?