The beauty of night:

...Quietness, alone with your thoughts
...Every little sound - the distant radio, crickets chirping, a car starting up, keys jingling - floats to you on the still night air - and just a hint of it, not too loud
...Flowers and leaves relaxing themselves, filling the air with sweetness
...Feeling drowsy, mind still awake

The beauty of day:
...Light - no lightbulbs needed
...The fresh feeling of being awake
...A time to 'do' things and accomplish