It's only over-prescription if the prevalence hasn't changed.

Your friends are 10 years older now than they were a decade ago.

There's more awareness of sleep apnea, and when you look at the risk of treatment vs the risk of it going untreated, things strongly favor throwing a CPAP at a patient.

The other thing that's happened over the last decade is American obesity rates have continued to climb. Overweight is correlated with sleep apnea, so all things equal you'd expect to see a corresponding rise in sleep apnea rates too.