A drunken night makes a cloudy morning. [ Proverb ]

Cloudy mornings may turn to clear evenings. [ Proverb ]

As long as you are fortunate you will have many friends, but if the times become cloudy you will be alone. [ Ovid ]

If you count the sunny and the cloudy days of the whole year, you will find that the sunshine predominates. [ Ovid ]

There are cloudy days for the mind as well as for the world, and the man who has the most genius is twenty times a day in the clouds. [ Beaumelle ]