Among the subjects were found 161 who were dominatingly right-handed and 31 who were dominatingly left-handed. With the righthand group, 52% went to sleep on their right side and 24% on their left. In the cases of the left-hand group, 54% went to sleep on their right and 39% on their left. Questions about the position during sleep gave figures which might be interpreted to show better sleep in the habitual position, but the differences were very small and some instances tended to suggest other implications. (PsycINFO Database Record (c) 2006 APA, all rights reserved)