Welcome back. I used to suffer from sleep Apnea. I basically lost weight. An ex told me she thought I had died in the night, as I didnt breath for about 10 seconds. Off to see the doc, then the hospital, checked oxygen levels were okay, then gave me a machine to check my sleeping pattern which confirmed I had the problem. It wasn't bad, hence the weight diagnosis.
It intrigued back in 2000 when I was hospitalised here for 6 weeks, and wired up to a machine for most of that duration, that there were no alarms, beeps or what have you's, so I guess it had gone!