by night
During the night.
He is a policeman by day and a thief by night.
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible. This I did. T. E. Lawrence
By night an atheist half believes in a God. Edward Young
Lord when you sell a man a book you don't sell just twelve ounces of paper and ink and glue - you sell him a whole new life. Love and friendship and humour and ships at sea by night - there's all heaven and earth in a book, a real book. Christopher Morley
He who does not lose his way by night will not lose his way by day. Nigerian Proverb
By day they're ready to divorce, by night they're ready for bed. Yiddish Proverb
Concealing truth is like wearing embroidered clothes and traveling by night. Chinese Proverb