The Effect of Psychological Factors on Sleep Disturbances in Young Adults

  • Received : 2020.02.11
  • Accepted : 2020.03.16
  • Published : 2020.03.30


Purpose: The purpose of this study was to assess influences of psychological factors on sleep disturbances in young adults through the revised version of the Minnesota Multiphasic Personality Inventory (MMPI-2). Methods: Two hundred and ninety nine college students in Gyeonggi-do completed the MMPI-2 and a questionnaire related to sleep disturbances and collected data were analyzed by logistic regression. Results: The odds of tooth grinding increased significantly with the increase of T-score of hysteria (Hy) scale. The increase of T-score of hypomania (Ma) and social introversion (Si) scale significantly contributed to the risk of insomnia. The occurrence of insomnia increased significantly as T-score of somatic complaints (RC1) and psychoticism (PSYC) scale increased. The odds of tooth grinding increased significantly as T-score of anxiety (ANX) and family problems (FAM) scale increased. The occurrence of insomnia decreased significantly with the increase of T-score of type A behavior (TPA) scale. The increase of T-score of dominance (Do) scale significantly contributed to the risk of tooth clenching. The odds of tooth grinding decreased significantly as T-score of MacAndrew alcoholism-revised (MAC-R) scale increased, whereas it increased significantly as T-score of addiction potential scale (APS) increased. No scale of MMPI-2 significantly affected the occurrence of snoring. Conclusions: T-scores of Hy, ANX, FAM, Do, MAC-R, and APS scales on MMPI-2 affected the risk of bruxism. T-scores of Ma, Si, RC1, PSYC, and TPA scales on MMPI-2 influenced the occurrence of insomnia. The psychometric instrument such as MMPI-2 is helpful in understanding and managing bruxism and insomnia.


Supported by : Shingu College


  1. Kang JK, Lim HD, Lee YM. Association between sleep quality and psychologic factors among university students in Korea. Korean J Oral Med 2008;33:257-267.
  2. Jang SM, Jeon HM, Kim KH, et al. Application of botulinum toxin on masticatory muscle of patients with bruxism. J Oral Med Pain 2014;39:55-62.
  3. Hui DS, Chan JK, Ho AS, Choy DK, Lai CK, Leung RC. Prevalence of snoring and sleep-disordered breathing in a student population. Chest 1999;116:1530-1536.
  4. Kim KS. Factors contributing to temporomandibular disorders. J Korean Dent Assoc 1991;29:354-358.
  5. Ahlberg J, Lobbezoo F, Ahlberg K, et al. Self-reported bruxism mirrors anxiety and stress in adults. Med Oral Patol Oral Cir Bucal 2013;18:e7-e11.
  6. Li AM, Au CT, So HK, Lau J, Ng PC, Wing YK. Prevalence and risk factors of habitual snoring in primary school children. Chest 2010;138:519-527.
  7. Vgontzas AN. Vgontzas. The diagnosis and treatment of chronic insomnia in adults. Sleep 2005;28:1047-1048.
  8. Manfredini D, Landi N, Fantoni F, Segu M, Bosco M. Anxiety symptoms in clinically diagnosed bruxers. J Oral Rehabil 2005;32:584-588.
  9. Restrepo CC, Vasquez LM, Alvarez M, Valencia I. Personality traits and temporomandibular disorders in a group of children with bruxing behaviour. J Oral Rehabil 2008;35:585-593.
  10. Enright PL, Newman AB, Wahl PW, Manolio TA, Haponik EF, Boyle PJ. Prevalence and correlates of snoring and observed apneas in 5,201 older adults. Sleep 1996;19:531-538.
  11. Buysse DJ, Angst J, Gamma A, Ajdacic V, Eich D, Rossler W. Prevalence, course, and comorbidity of insomnia and depression in young adults. Sleep 2008;31:473-480.
  12. Singareddy R, Vgontzas AN, Fernandez-Mendoza J, et al. Risk factors for incident chronic insomnia: a general population prospective study. Sleep Med 2012;13:346-353.
  13. Park BO, Lee HC, Jang MJ, Shim JC. MMPI profiles of the patients with bruxism. J Korean Neuropsychiatr Assoc 1999;38:523-529.
  14. Aikens JE, Caruana-Montaldo B, Vanable PA, Tadimeti L, Mendelson WB. MMPI correlates of sleep and respiratory disturbance in obstructive sleep apnea. Sleep 1999;22:362-369.
  15. Graham JR. MMPI-2: assessing personality and psychopathology. 5th ed. New York: Oxford University Press; 2011. pp. 63-221.
  16. Cain N, Gradisar M. Electronic media use and sleep in schoolaged children and adolescents: a review. Sleep Med 2010;11:735-742.
  17. Lemola S, Perkinson-Gloor N, Brand S, Dewald-Kaufmann JF, Grob A. Adolescents' electronic media use at night, sleep disturbance, and depressive symptoms in the smartphone age. J Youth Adolesc 2015;44:405-418.
  18. Wieckiewicz M, Paradowska-Stolarz A, Wieckiewicz W. Psychosocial aspects of bruxism: the most paramount factor influencing teeth grinding. Biomed Res Int 2014;2014: 469187.
  19. Glaros AG. Incidence of diurnal and nocturnal bruxism. J Prosthet Dent 1981;45:545-549.
  20. Lechner M, Breeze CE, Ohayon MM, Kotecha B. Snoring and breathing pauses during sleep: interview survey of a United Kingdom population sample reveals a significant increase in the rates of sleep apnoea and obesity over the last 20 years - data from the UK sleep survey. Sleep Med 2019;54:250-256.
  21. Cho YW, Shin WC, Yun CH, Hong SB, Kim J, Earley CJ. Epidemiology of insomnia in korean adults: prevalence and associated factors. J Clin Neurol 2009;5:20-23.
  22. Molina OF, Peixoto MGS, Santos ZC, Penoni JDS, Aquilino RN, Peixoto MAS. Bruxism as mechanism subserving hysteria: a new theory. Rev Neurocienc 2008;16:262-268.
  23. Gungormus Z, Erciyas K. Evaluation of the relationship between anxiety and depression and bruxism. J Int Med Res 2009;37:547-550.
  24. Bertazzo-Silveira E, Kruger CM, Porto De Toledo I, et al. Association between sleep bruxism and alcohol, caffeine, tobacco, and drug abuse: a systematic review. J Am Dent Assoc 2016;147:859-866.
  25. van de Laar M, Verbeek I, Pevernagie D, Aldenkamp A, Overeem S. The role of personality traits in insomnia. Sleep Med Rev 2010;14:61-68.
  26. Mendelson WB, Garnett D, Gillin JC, Weingartner H. The experience of insomnia and daytime and nighttime functioning. Psychiatry Res 1984;12:235-250.
  27. Schneider-Helmert D. Twenty-four-hour sleep-wake function and personality patterns in chronic insomniacs and healthy controls. Sleep 1987;10:452-462.
  28. Freedman RR, Sattler HL. Physiological and psychological factors in sleep-onset insomnia. J Abnorm Psychol 1982;91:380-389.
  29. Shealy RC, Lowe JD, Ritzler BA. Sleep onset insomnia: personality characteristics and treatment outcome. J Consult Clin Psychol 1980;48: 659-661.
  30. Lee JS, Yoo RY, Nam HJ, et al. Clinical characteristics of elderly patients aged over 65 years with insomnia symptoms. J Korean Sleep Res Soc 2013;10:25-30.