The work day is over. You have free time to do as you wish.
Why is it that I feel happiest at night?
Its because after working for whole day finally you get time for yourself when you can do anything you want and also you can think for your future with free mind and no one is there to cross question you, and it's the time to relax your mind and body
I feel the same. Even though I know I need to get up early, I can't go to sleep unless it's very late, 'cause I enjoy night that much. Maybe that's because we feel closer to the Universe, to nature and to ourselves when it's dark and late outside.
Your relaxing at home.