I haven't been able to sleep more than 5 hours at a time for years. I usually wake up after about 3-3.5 hours of sleep. Prior to starting CPAP 6 weeks ago, I would struggle to get back to sleep, often never getting back to sleep. My sleep patterns haven't changed all that much since I started my therapy, however more often than not, I've found that I have been able to get back to sleep within 15 minutes, which is encouraging. However, lately my insomnia has returned in some ways, in that occasionally I will have trouble getting back to sleep.
I'm not happy with my AHI level, it's averaging a little over 6.0 since I started and I think an increase in pressure is inevitable. Maybe that will help break the pattern and allow me to stay asleep longer.