Morgen means "morning," and a Muffel is a sullen person, a grouch. Put together, they signify a person who habitually wakes up in a bad mood and needs some time before being able to face the world with an even temper.
The late German chancellor Willy Brandt was, according to his wife Ruth, a Morgenmuffel. And recently, I came across a study dealing with the important question why (German) teenagers are such Morgenmuffel (the plural is the same as the singular).
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