Mitsuo Hayashi1, Naoko Motoyoshi, Tadao Hori. 1. Department of Behavioral Sciences, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, Japan. mhayasi@hiroshima-u.ac.jp
Abstract
STUDY OBJECTIVES: The recuperative effect of a nap of less than 30 minutes has been confirmed. Such naps consist mainly of stages 1 and 2 sleep. The present study examined whether sleep stage 1 or 2 contributed to the recuperative effect of a short nap. DESIGN: Repeated-measurement within-subject design. After sleep was restricted to 1.5 hours less than their usual nocturnal sleep, participants took a rest (No-nap condition) or a nap at 2:00 PM. In the nap condition, they were awakened after 5 minutes of stage 1 sleep (S1-nap condition) or 3 minutes after stage 2 sleep appeared (S2-nap condition). SETTING:University sleep laboratory. PARTICIPANTS: Ten healthy university students (aged 19 to 24 years). MEASUREMENTS: Subjective mood, performance on visual detection and symbol-digit substitution tasks, and the number of slow eye movements during a performance task were measured before and after the nap or rest. RESULTS: In the No-nap condition, subjective mood and performance deteriorated, and Slow eye movements increased during mid-afternoon, suggesting that the post-lunch dip occurred. In contrast, subjective alertness and performance improved and slow eye movements rarely occurred in the S2-nap condition. Although subjective sleepiness and fatigue improved, performance deteriorated and slow eye movements increased in the S1-nap condition. CONCLUSION: A daytime short nap containing 3 minutes of stage 2 sleep has recuperative effects, whereas these effects are limited following only stage 1 sleep.
RCT Entities:
STUDY OBJECTIVES: The recuperative effect of a nap of less than 30 minutes has been confirmed. Such naps consist mainly of stages 1 and 2 sleep. The present study examined whether sleep stage 1 or 2 contributed to the recuperative effect of a short nap. DESIGN: Repeated-measurement within-subject design. After sleep was restricted to 1.5 hours less than their usual nocturnal sleep, participants took a rest (No-nap condition) or a nap at 2:00 PM. In the nap condition, they were awakened after 5 minutes of stage 1 sleep (S1-nap condition) or 3 minutes after stage 2 sleep appeared (S2-nap condition). SETTING: University sleep laboratory. PARTICIPANTS: Ten healthy university students (aged 19 to 24 years). MEASUREMENTS: Subjective mood, performance on visual detection and symbol-digit substitution tasks, and the number of slow eye movements during a performance task were measured before and after the nap or rest. RESULTS: In the No-nap condition, subjective mood and performance deteriorated, and Slow eye movements increased during mid-afternoon, suggesting that the post-lunch dip occurred. In contrast, subjective alertness and performance improved and slow eye movements rarely occurred in the S2-nap condition. Although subjective sleepiness and fatigue improved, performance deteriorated and slow eye movements increased in the S1-nap condition. CONCLUSION: A daytime short nap containing 3 minutes of stage 2 sleep has recuperative effects, whereas these effects are limited following only stage 1 sleep.
Authors: Mohd Amzari Tumiran; Noor Naemah Abdul Rahman; Rohaida Mohd Saat; Nurul Kabir; Mohd Yakub Zulkifli; Durriyyah Sharifah Hasan Adli Journal: J Relig Health Date: 2018-08
Authors: Sharon A Fitzgerald; Donna Macan Yadrich; Marilyn Werkowitch; Ubolrat Piamjariyakul; Carol E Smith Journal: Comput Inform Nurs Date: 2011-11 Impact factor: 1.985