Using electronic media before sleep can curtail sleep time and result in self-perceived insufficient sleep

Authors

  • Nakamori SUGANUMA,

    Corresponding author
    1. Osaka University Health Care Center, Toyonaka,
    2. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
      Dr Nakamori Suganuma, Osaka University Health Care Center, Department of Psychiatry, Graduate School of Medicine, Osaka University, 2-2-D3 Yamadaoka, Suita, Osaka 565-0871, Japan. Email: sug@psy.med.osaka-u.ac.jp
    Search for more papers by this author
  • Tomoharu KIKUCHI,

    1. Osaka University Health Care Center, Toyonaka,
    2. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Kentarou YANAGI,

    1. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Schuhei YAMAMURA,

    1. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Hiroko MORISHIMA,

    1. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Hiroyoshi ADACHI,

    1. Osaka University Health Care Center, Toyonaka,
    2. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Takayuki KUMANO-GO,

    1. Osaka University Health Care Center, Toyonaka,
    2. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Akira MIKAMI,

    1. Osaka University Health Care Center, Toyonaka,
    2. Osaka Prefectural Mental Health Center, Osaka, Osaka, Japan
    Search for more papers by this author
  • Yoshiro SUGITA,

    1. Osaka University Health Care Center, Toyonaka,
    2. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author
  • Masatoshi TAKEDA

    1. Osaka University Graduate School of Medicine, Course of Internal Medicine, Division of Psychiatry Suita and
    Search for more papers by this author

  • The source(s) of support in the form of grants: this study was supported by the Health Promotion Foundation as a grant of 500 000 yen.

Dr Nakamori Suganuma, Osaka University Health Care Center, Department of Psychiatry, Graduate School of Medicine, Osaka University, 2-2-D3 Yamadaoka, Suita, Osaka 565-0871, Japan. Email: sug@psy.med.osaka-u.ac.jp

Abstract

Electronic media are widespread and research has revealed connections between media use and sleep loss. In this study we aimed to elucidate how many media users get insufficient sleep and whether lengthy media use before sleep curtails sleep. Registered monitor members were surveyed twice on the Internet. The prevalence of self-perceived insufficient sleep ascribed by respondents to using electronic media before sleep was 48.0% (first survey) and 45.0% (second survey). Younger respondents more frequently ascribed using media before sleep as a factor in their perceived insufficient sleep than older respondents. After excluding respondents who ascribed their perceived insufficient sleep to factors other than the electronic media, the sleep duration before a workday was 6.38 ± 1.04 h for light media users (<2.5 h) before sleep, 6.20 ± 1.10 h for intermediate users (≥2.5 and <3.5 h) and 6.22 ± 1.09 h for heavy users (≥3.5 h). A Scheffe analysis revealed a significant difference between the light users and medium users (P = 0.02), and between light users and heavy users (P = 0.03). Only 29.0% of light users perceived they had insufficient sleep compared to 53.5% of heavy users. Users who perceived they had insufficient sleep reported a greater disparity in their sleep duration before workdays compared with that before non-workdays (P < 0.001) and a greater disparity between their perceived sufficient sleep hours and their actual sleep time before workdays (P < 0.001). There was a significant difference in disparity between perceived sufficient sleep and actual sleep time before workdays among media use groups (P = 0.002). Because half the respondents ascribed insufficient sleep to using electronic media, attention should be given to media use before sleep as a cause of perceived insufficient sleep.

Ancillary