Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Sleep quality
RCT 4-armed trial	137 people, eastward flight crossing 6–9 time zones	Overall self-rated sleep quality (measured using a 5-point rating scale) during the flight with zolpidem plus melatonin during the flight and at bedtime for 4 consecutive days after the flight with zolpidem alone during the flight and at bedtime for 4 consecutive days after the flight Absolute results not reported	Reported as not significant		Not significant