No caffeine is best, if not that than nor more than the equivalent of two cups drank in the morning, nothing with caffeine in it (tea, coke, chocolate,..) ever, or again not after 12 noon. It take hours for this stuff to work its way out of the system, I believe.
Sounds like you need more sleep, the "when the sun is out" is a bit baffling. I have suffered from a similar problem as well as other problems. I now drive with very few problems of my past, and about all I have done is confront the problems, head on. I focused my mind to overrule the problem driving issues... it has mostly worked, the same workd for me on flying in an airplane. I had a job that I wanted to keep that involved international travel, I have over a million miles on United Airlines - and while never totally comfortable I was able to travel and sleep on long flights - my biggest problem with air travel is the size of the coach seat, I'm a big guy, on a very tall frame.
Apnea is dangerous, I hope the bed arrangement reduces your risk.,