Same problem, been that way for years. I go to bed around 10, sleep hard for 4 hours, then lay awake for another 4, then sleep off and on for another 1 1/2 hours. At my age, a 1/2 hour nap just after lunch is a great thing, in the summer it's done outside in my hammock , winter in my recliner.
My Doctor says it's fairly normal, been tested, don't need a CPAP