A recent study of data of 7,189 adults (between the ages of 25 and 74 years) from the National survey of Midlife Development, USA, at the University of Kansas revealed that insomnia symptoms had a significant relationship with both psychological(one’s overall mental health) and subjective well-being (one’s perception of his/her life), but a stronger relationship to subjective well-being. The results suggest that symptoms of insomnia are closely linked with lower levels of well-being.

J Consult Clin Psychol. 2007 Dec; 75(6); 939-46

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