title: Weekend sleep intervention for workers with habitually short sleep periods.
abstract: OBJECTIVE
  This study was conducted to determine whether extended sleep time during the weekend improves alertness and performance during the subsequent week for workers who are habitually short on sleep time.
  
  
  METHODS
  Daytime employees in the manufacturing industry [38.3, standard deviation (SD) 8.1 years old, mean weekday sleep ≤6 hours] participated in a study that lasted 3 successive weeks. Participants were instructed to stay in bed for ≥8 hours between 22:00-09:00 hours on weekends during the first week as a sleep intervention condition and keep their habitual sleep-wake patterns as a habitual weekend sleep condition beginning the weekend of the second week through Thursday of the third week. Half the participants underwent the conditions in one order and the other half in the reverse. Sleep was monitored by an actigraph. A psychomotor vigilance task, subjective fatigue, and blood pressure were measured on Monday and Thursday during the afternoon each week.
  
  
  RESULTS
  Sleep duration on weekends was approximately 2 hours longer per day during the intervention. However, sleep duration during weekdays following the intervention returned to shorter periods. Significantly shorter reaction times and a smaller number of lapses on the psychomotor vigilance task were found on Mondays after the intervention than after the habitual weekend sleep. The opposite results, however, were observed on Thursdays.
  
  
  CONCLUSIONS
  Sleep extension on weekends may be effective in improving alertness and performance during the first days in subsequent weeks among workers with short sleep times. These benefits might be maintained if sufficient sleep duration continues.
authors.affiliation: National Institute of Occupational Safety and Health, Kawasaki, Japan. kubo@h.jniosh.go.jp
authors.forename: Tomohide
authors.initials: T
authors.lastname: Kubo
authors.forename: Masaya
authors.initials: M
authors.lastname: Takahashi
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Sato
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sasaki
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Oka
authors.forename: Kenji
authors.initials: K
authors.lastname: Iwasaki
mesh_terms: D000704:Analysis of Variance; D001794:Blood Pressure; D005221:Fatigue; D006801:Humans; D007564:Japan; D016272:Occupational Health; D011597:Psychomotor Performance; D012892:Sleep Deprivation / Q000503:physiopathology / Q000628:therapy*; D011795:Surveys and Questionnaires