Night by night

nightly; many nights.

See also: Night

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
The sun is ever full and bright, The pale moon waneth night by night. Why should this be?
And when the hall was built, there night by night the thanes gathered and rejoiced with their King; and there, when the feast was over, they lay them down to sleep.
Staff at the Caludon Centre mental health unit at Walsgrave have been forced to handle the demand on a "night by night" basis.