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The effects of a 30-min nap during night shift following a prophylactic sleep in the afternoon

journal contribution
posted on 06.12.2017, 00:00 by N Lovato, L Lack, Sally FergusonSally Ferguson, R Tremaine
The purpose of this study was to investigate the effects of a 30-min nap, during a simulated nightshift environment, when a prophylactic daytime sleep was implemented prior to the night shift. A repeated-measures counter balanced design was used which included two experimental conditions: a 30-min nap and a no nap control. In both conditions subjects obtained a 2-h sleep in the afternoon from 15.00–17.00 hours, which was followed by the night-time nap from 02.30–03.00 hours in a controlled laboratory environment. Post-nap testing was conducted from 03.10 to 07.00 hours. The participants included 22 adults aged from 18–35 years who were good sleepers and did not regularly nap. Subjective alertness (Stanford Sleepiness Scale, Karolinska Sleepiness Scale, Visual AnalogScale), fatigue and vigor (Profile of Mood States), cognitive performance (psychomotor vigilance task, symbol–digit substitution task, letter cancellation task), and objective sleepiness were measured preandpost-nap. The 30-min nap resulted in some impairment of subjective alertness for a brief period (up to 30 min) immediately following the nap when compared to the no nap condition. Following this brief period, alertness and performance were generally improved by the 30-min nap from 04.00 hours until the end of the testing period at 07.00 hours. The results of this study indicate thatwhen a 2-h prophylactic sleep is implemented in the afternoon, a 30-min nap during the subsequentsimulated night shift overall provides a significant countermeasure against sleepiness and performance impairment.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

7

Issue

1

eISSN

1479-8425

ISSN

1446-9235

Location

Australia

Publisher

Wiley-Blackwell

Language

en-aus

Peer Reviewed

Yes

Open Access

No

Era Eligible

Yes

Journal

Sleep and biological rhythms.