Abstract
We previously reported a patient with Machado-Joseph Disease (MJD) who had severe insomnia and a low serum melatonin (MLT) level, and whose insomnia was alleviated by oral MLT replacement therapy. The aims of this study were to examine whether patients with MJD are likely to have insomnia, and whether there is a relationship between the degree of insomnia and the serum MLT level among patients with MJD. This study included 8 patients with MJD. A 58-year-old-patient with cervical spondylosis was also included in this study to check the condition of the test room for slee**. All patients filled out the Japanese version of Pittsburgh Sleep Quality Index (PSQI-J) questionnaire. We obtained blood samples at 12:00 and 24:00 hours to measure the MLT level. We checked the sleep condition of the patient once an hour and recorded the grade in sleep-logs: the grades of sleep condition were asleep, sleepy, or awake. Statistical analyses were performed to search for correlations between the PSQI score and the serum MLT level or actual sleep time using Spearman’s rank correlation coefficient. Seven of the 8 MJD patients had a total PSQI score of above 5.5 (cut-off level). The daytime MLT level (at 12:00 hours) was below 2.8 pg/mL in all 8 patients, whereas the mean night-time MLT level (at 24:00 hours) of the MJD patients (23.6 ± 17.5 pg/mL) was lower than that of the control patient (43.0 pg/mL) and also lower than the reported cut-off level among healthy people aged 30–50 years (55.5 pg/mL). There was a negative correlation between the total PSQI score and the serum MLT level among the MJD patients (P < 0.05). Our results show that a low serum MLT level may contribute to insomnia in patients with MJD.
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Takei, A., Fukazawa, T., Hamada, T. et al. Serum melatonin levels and insomnia in patients with Machado-Joseph Disease. Sleep Biol. Rhythms 2, 209–214 (2004). https://doi.org/10.1111/j.1479-8425.2004.00144.x
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DOI: https://doi.org/10.1111/j.1479-8425.2004.00144.x