A Korean study compared the effects of a four-week laughter therapy program with a control group (no laughter therapy) on measures of depression, insomnia, sleep quality, thinking (cognitive) function, and health-related quality of life in 109 senior citizens (average age 75 years). At the end of the four weeks, depressive symptoms improved significantly among the people in the laughter group, but not in the control group. People in the laughter group had significant improvements in some measures of health-related quality of life, including vitality, general health, and mental health. Sleep quality and insomnia also improved significantly after laughter therapy. No changes in cognitive function were noted in either group.
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