Sleep and circadian rhythm alterations correlate with depression and cognitive impairment in Huntington's disease.
OBJECTIVE
Sleep disturbances are a prominent feature of Huntington's disease (HD) and can substantially impair patients' quality of life. However, sleep complaints and their association with other symptoms and signs of HD have not yet been assessed in large groups of patients or premanifest mutation carriers. Therefore, we aimed to delineate the nature of subjective sleep disturbances and identify important correlates of sleep impairment in HD patients and premanifest mutation carriers.


METHODS
Using standardized questionnaires (including Epworth's Sleepiness Scale, Pittsburgh Sleep Quality Index, SCOPA-SLEEP, and Beck's Depression Inventory), daytime sleepiness, night-time sleep, and depressed mood were assessed in 63 HD patients, 21 premanifest mutation carriers and 84 controls.


RESULTS
Night-time sleep impairment was significantly more prevalent in HD patients compared with controls (58.1% vs. 34.9%, p = 0.012), but daytime sleepiness was not (12.7% vs. 7.9%, p = 0.560). Depression was the only independent correlate of night-time sleep impairment in HD patients, accounting for 10% of the variance. Compared with controls, both sleep onset latency and wake-up time were significantly delayed in HD patients. Moreover, in HD patients, later wake-up time was significantly associated with cognitive score (r = -0.43), total functional capacity (r = -0.54) and depressive symptoms (r = +0.47). In general, the degree of sleep (phase) changes in premanifest mutation carriers lay in between those of HD patients and controls.


CONCLUSIONS
HD is primarily accompanied by night-time sleep disturbances and a delayed sleep phase, which are associated with depression and lower cognitive as well as functional performance.
Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands. N.A.Aziz@lumc.nl <N.A.Aziz@lumc.nl>
N Ahmad
NA
Aziz
Galia V
GV
Anguelova
Johan
J
Marinus
Gert Jan
GJ
Lammers
Raymund A C
RA
Roos
D000328:Adult; D002940:Circadian Rhythm / Q000502:physiology*; D003072:Cognition Disorders / Q000209:etiology*; D003863:Depression / Q000209:etiology*; D005260:Female; D006801:Humans; D006816:Huntington Disease / Q000150:complications*; D008297:Male; D008875:Middle Aged; D011569:Psychiatric Status Rating Scales; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012890:Sleep / Q000502:physiology*; D020178:Sleep Disorders, Circadian Rhythm / Q000209:etiology*; D013223:Statistics as Topic; D018709:Statistics, Nonparametric