Do you know whats wrong with me?

I have just found out something about my self.Something I didn't realize.When the suns goes down my emotional state changes.I get depressed and lonely for some reason.My Mom who had Alzheimers did this and after reading up on when she was alive it was called sundowning.Sundowning is when people with Alzheimers start feeling agitated.I don't feel agitated but I feel depressed and lonely.Have no idea whats going on.Being diabetic maybe that is the reason,I did research on the web about that but it was no real help.Mornings I so full of energy and want to talk and have fun but this is getting to me a bit.I guess more research is needed.Hmmm should I fear the men in the white coats and nets?