Sleep and Biological Rhythms
Official Journal of the Japanese Society of Sleep Research
Volume 19 · Number 4 · 2021
EDITORIAL

Sleep disorders in cancer patients
O. Itani 341
ORIGINAL ARTICLESA school-based sleep education program to improve
sleep duration, latency, and efficiency of Spanish
childrenM. Ávila-García · F.J. Huertas-Delgado · P. Tercedor 343
Sleep quality according to the Pittsburgh Sleep Quality
Index in over 7000 pregnant women in Poland
M. Smyka · K. Kosińska-Kaczyńska ·N. Sochacki-Wójcicka · M. Zgliczyńska ·M. Wielgoś 353
Elevated perceived stress scale (PSS) scores areassociated with increased risk of poor sleep assessedby global PSQI scores: cancer and hypnotics-stratified
analysis in an adult population-based study
Y. Xu · A. Liu 361
Subjective sleep quality, quantitative sleep features,and their associations dependent on demographic
characteristics, habitual sleep–wake patterns, anddistinction of weekdays/weekends
S. Choilek · A. Karashima · I. Motoike · N. Katayama ·K. Kinoshita · M. Nakao 369
Sleep disturbances in essential tremor: an investigationof associated brain microstructural changes using
diffusion tensor imaging
Y. Sengul · H. Otcu Temur · H.S. Sengul · I. Ustun ·K. Radler · A. Alkan · E.D. Louis 383
Obsessive–compulsive disorder in restless legs
syndrome
Y. Erdal · S. Perk · A. Alnak · E. Liman · H. Dereci ·U. Emre 393
The association between beta-blocker therapy anddaytime sleepiness in obstructive sleep apnoea
M. Meszaros · A.G. Mathioudakis · M. Xanthoudaki ·V. Sircu · E. Nena · J. Vestbo · A. Corlateanu ·P. Steiropoulos · A. Bikov 399

Regional variations in the utilization of adaptive servoventilation and continuous positive airway pressure
in Japan: data from the National Database of Health
Insurance Claims and Specific Health Checkups ofJapan (NDB) Open Data Japan
T. Saito · S. Nojiri · R. Naito · H. Daida · T. Kasai 409
Prevalence and predictors of REM sleep without atonia
in a sleep clinic population
C. Yu · J. Stonehouse · A.R. Turton · S.A. Joosten ·G.S. Hamilton 423
Combined and isolated effects of alcohol consumptionand sleep deprivation on maximal strength, muscle
endurance and aerobic exercise performance in healthy
men: a cross-over randomized controlled trial
R. Rodrigues · R. de Azevedo Franke · B.C. Teixeira ·R.C.O. Macedo · A.L. Lopes · F. Diefenthaeler ·Á. Reischak-Oliveira · B.M. Baroni · M.A. Vaz 433
Application of the Chinese version of the 11-item
circadian-type inventory (CTI-11) in a working sample
D. Wang · H. Chen · D. Chen · Z. Zhu · X. Zhou ·D. Meng · F. Fan · X. Liu 443
Prevalence of restless legs syndrome: a cross-sectional
population-based study from northwest of Turkey
S. Aksoy · E. Eker · S. Yalcin · H.I.O. Karaman 453
Validity and reliability of the Turkish version of theinsomnia catastrophizing scale
F. Kabadayi · O. Mercan · S. Yazici-Kabadayi ·Y.E. Elhatip · B. Büyüksevindik 459
Sleep disturbance among frontline nurses during theCOVID-19 pandemic
M. Al Maqbali 467
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