We say that a person has “Got Out Of Bed On The Wrong Side” when they are being grumpy and bad tempered throughout the day. An ancient superstition puts forward that evil spirits lie during the night on the left side of the bed. People believed it was unlucky to emerge in the morning on that side as it would mean the evil spirits’ influence would possess the body during its waking hours. If you get out of bed on the wrong side you could only put it right the following morning by getting out on the right side.