This study investigated the effect of acute night-time blue-light exposure through electronic device use on sleep quality/quantity, exercise motivation and perceived exertion during exercise the following day. In a randomised, crossover design, 14 participants read a book on an iPad (light) or a hard-copy book (control) one hour before bedtime. Small but not significant differences in perceived sleep quality and quantity and measured sleep efficiency were found between light and control trials, suggesting that sleep may be negatively affected following one night of electronic device use. This did not impact motivation to exercise or perceived exertion during exercise the following day.
Keywords: Sleep deprivation; blue-light; exercise; obesity.