A new study has found that there may be some truth to the old excuse for grumpiness of waking up on the wrong side of the bed. The research included 3,000 people residing in the U.K. In the end, the study revealed that those people who sleep to the left of their husband or wife are more likely to be cheerful during the day and also can deal with heavy work loads better. In addition, these “left siders” noted that they resist changing sides of the bed in fear that this change may affect their daily mood.