Effect of prenap coffee on daytime sleepiness in university students
DOI:
https://doi.org/10.18203/2320-6012.ijrms20201344Keywords:
Daytime sleepiness, Prenap coffee, Sleep inertiaAbstract
Background: Daytime sleepiness impairs academic performance in college students. Napping is a counter to daytime sleepiness, but often causes sleep inertia on waking up. Caffeine absorption from beverages peaks 30 minutes after their ingestion presenting a window of opportunity to have a short nap such that the time of waking up is in synchrony with onset of action of caffeine; thereby abolishing post-nap inertia and achieving synergistic mitigation of fatigue.
Objective of this study to assess effect of nap, coffee, ‘coffee and nap’ and ‘wakeful break without coffee’ on daytime sleepiness using Psychomotor Vigilance Tests (PVTs) and Karolinska Sleepiness Scale (KSS) score.
Methods: After Institutional Review Board clearance, 10 subjects (aged 19-21 years) were selected using their Epworth Sleepiness Scale score (ESS >5) and called to the study site 8 times on different days to be exposed to these four conditions twice - only coffee (standardized), only nap (30min), coffee immediately followed by 30min nap, wakeful break (30min) without coffee or nap. Pre and post scores were recorded for electronic PVT (Reaction Time and Motor Responsiveness) and KSS for each attempt.
Results: Test outcome was associated with intervention used (p=0.00001). ‘Nap only’ group was associated with deterioration in outcomes (p=0.00001), accounting for highest percentage (41%) of all deteriorated test outcomes. ‘Coffee only’ group was associated with improvement in test scores (p=0.00001), responsible for highest share (38.8%) of all improved test outcomes. ‘Nap only’ and ‘Coffee-nap’ group showed improvement in 11.67% and 21.67% of outcomes respectively.
Conclusions: Pre-nap coffee is a proactive counter-measure to post nap sleep inertia.
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References
Giri P, Baviskar M, Phalke D. Study of sleep habits and sleep problems among medical students of pravara institute of medical sciences loni, Western maharashtra, India. Ann Med Health Sci Res. 2013 Jan;3(1):51-4.
Hershner SD, Chervin RD. Causes and consequences of sleepiness among college students. Nat Sci Sleep. 2014 Jun 23;6:73-84.
Upadhyay D, Agrawal S, Verma A, Mahajan A, Shah N. Evaluation of Prevalence of Daytime Sleepiness and its Association with Chronotype in Undergraduate Medical and Paramedical Students. Natl J Integr Res Med. 2019;Vol.10(4):10-7.
Singh R, Sharma R, Suri JC, Das S. Is daytime napping a healthy habit in adolescents? Indian J Sleep Med. 2009;4(4)136-42.
Tietzel AJ, Lack LC. The short-term benefits of brief and long naps following nocturnal sleep restriction. Sleep. 2001 May 1;24(3):293-300.
Hilditch CJ, Dorrian J, Banks S. Time to wake up: reactive countermeasures to sleep inertia. Ind Health. 2016 Dec 7;54(6):528-41.
Duggan KA, McDevitt EA, Whitehurst LN, Mednick SC. To Nap, Perchance to DREAM: A Factor Analysis of College Students' Self-Reported Reasons for Napping. Behav Sleep Med. 2018 Mar-Apr;16(2):135-53.
Brooks A, Lack L. A brief afternoon nap following nocturnal sleep restriction: which nap duration is most recuperative? Sleep. 2006 Jun; 29(6):831-40.
Winston AP, Hardwick E, Jaberi N. Neuropsychiatric effects of caffeine. Adv Psychiatr Treatment. 2005 Nov;11(6):432-9.
Landrum RE. College students use of caffeine and its relationship to personality. College Student J, 1992;26(2),151-5.
Gera M, Kalra S, Gupta P. Caffeine Intake Among Adolescents in Delhi. Ind J Community Med. 2016 Apr-Jun;41(2):151-3.
Liguori A, Hughes JR, Grass JA. Absorption and subjective effects of caffeine from coffee, cola and capsules. Pharmacol Biochem Behav. 1997 Nov;58(3):721-6.
Reyner LA, Horne JA. Suppression of sleepiness in drivers: combination of caffeine with a short nap. Psychophysiology. 1997 Nov;34(6):721-5.
Van Dongen HP, Price NJ, Mullington JM, Szuba MP, Kapoor SC, Dinges DF. Caffeine eliminates psychomotor vigilance deficits from sleep inertia. Sleep. 2001 Oct 1;24(7):813-9.
Johns MW. A new method for measuring daytime sleepiness: the Epworth sleepiness scale. Sleep. 1991 Dec;14(6):540-5.
Horne JA, Ostberg O. A self-assessment questionnaire to determine morningness-eveningness in human circadian rhythms. Int J Chronobiol. 1976;4(2):97-110.
NSF Official Sleep Diary. National Sleep Foundation. Available at: https://www.sleepfoundation.org/articles/nsf-official-sleep-diary. Assessed 8 Jan 2018.
Kaida K, Takahashi M, Akerstedt T, Nakata A, Otsuka Y, Haratani T, et al. Validation of the Karolinska sleepiness scale against performance and EEG variables. Clin Neurophysiol. 2006 Jul;117(7):1574-81.
Jim Allen. The Online Reaction Time Test © 2002. Available at: https://faculty.washington.edu/chudler/java/redgreen.html. Assessed 17 Jan 2018.
Hit-the-Dot. UW Faculty Web Server. Available at: https://faculty.washington.edu/chudler/java/dottime.html. Assessed 18 Jan 2018.
Lee TY, Chang PC, Tseng IJ, Chung MH. Nocturnal sleep mediates the relationship between morningness–eveningness preference and the sleep architecture of afternoon naps in university students. PLoS One. 2017 Oct 1;12(10);0185616.
Valdez P. Circadian Rhythms in Attention. Yale J Biol Med. 2019 Mar 25;92(1):81-92.
Caldwell JA, Caldwell JL, Thompson LA, Lieberman HR. Fatigue and its management in the workplace. Neurosci Biobehav Rev. 2019 Jan;96:272-89.
Dinges DF, Pack F, Williams K, Gillen KA, Powell JW, Ott GE, Aptowicz C, Pack AI. Cumulative sleepiness, mood disturbance, and psychomotor vigilance performance decrements during a week of sleep restricted to 4-5 hours per night. Sleep. 1997 Apr;20(4):267-77.
Calbet JA, MacLean DA. Role of caloric content on gastric emptying in humans. J Physiol. 1997 Jan 15;498(Pt 2):553-9.
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