(PW) be in a bad mood
My son has been cranky all day. I think he got up on the wrong side of the bed.
(allwords) verb
(idiom) To feel irritable; to be in a bad mood; to have a bad day from the start, for no particular reason.
I think my boss got up on the wrong side of bed this morning. He's been grumpy all day.
(free) get into bed with
Slang To become closely involved with another person or group, as in an intrigue: "The Israelis were experienced at this kind of [covert] ... work, but it was essential that the administration not get into bed with them on this" (Bob Woodward).
(idiommeaning) to wake up in a bad mood
What’s wrong with you today, did you get up on the wrong side of the bed?
My brother got up on the wrong side of the bed this morning, he’s very angry for no reason!
If you keep getting up on the wrong side of the bed, you’re not going to have many friends left. You’re annoying everybody!
(idiom) be in a bad or grumpy mood
Compare bear with a sore head
Example Watch the boss this morning – he seems to have got up on the wrong side of the bed!
(Note From a popular saying based on an old superstition traceable back at least to Roman times. The Romans believed it was unlucky to get out of bed on the left side, because it was on that side that evil spirits lived. These would then proceed to plague your day.)
(phrases.org) GET UP ON THE WRONG SIDE OF THE BED - "The wrong side of the bed is the left side, according to a superstition that goes back to the time of the Romans. People have been saying other people 'got up on the wrong side of the bed,' 'awoke surly or grouchy,' for well over three centuries now, usually not knowing the real meaning of what they are saying, but the equally old expression 'got up left foot forward' tells the story. The supposedly sinister nature of the left is reflected in many English superstitions and expressions, such as the belief that it is unlucky to put your left shoe first, or to walk into a house left foot first. The Romans, especially Augustus Caesar, were very careful that they got up on the right side of the bed, but there is no evidence that they were less grouchy than anyone else." From "Encyclopedia of Word and Phrase Origins" by Robert Hendrickson (Facts on File, New York, 1997).
