We are getting dark here earlier too. I don't like the dark now, neither does Jake since he has to go for a ride sometimes if I feel really bad. Good thing is we don't have to leave the van at all if we don't want to visit a place. Second best thing to my bus I sold or practically gave away.
In daylight I can get busy but at night if I get up and get busy, it wakes up Jake then he is up for the night. I tired the Melatonin and it didn't stop me from waking up after an hour or two sleep, then sleep comes and goes throughout the night most nights. Jake will get up and walk around, he can't stay in the bed, but he is quite doing so.