Is it normal to feel more depressed at night than during the day?

I am happy, bubbly, and bouncy during the day. But as soon as night falls, I become very depressed. I don’t know why. It is very bothersome, because it happens as soon as I decide to go to bed. It takes many hours of crying to exhaust me enough to fall asleep. Any suggestions will help.
(I know many of you will tell me I to see a psychologist. I have already scheduled an appointment, but can’t be seen till next week.)