{adv. phr.} After sleeping on it; after giving it more thought; using common sense and looking at the matter unemotionally and realistically. * /Lost night my ideas seemed terrific, but in the cold light of day I realize that they won't work./
IN THE COLD LIGHT OF DAY
Meaning of IN THE COLD LIGHT OF DAY in English
Slang English vocab. Английский сленговый словарь. 2012