Complex sentence: Residual'hangover' effects, such as sleepiness and impaired psychomotor and cognitive function, after nighttime administration may persist into the next day, which may impair the ability of users to drive safely and increase risks of falls and hip fractures.
Split into simpler sentences: Residual'hangover' effects, such as sleepiness and impaired psychomotor and cognitive function, may persist into the day following nighttime administration. Such effects may impair the ability of users to drive safely and increase risks of falls and hip fractures.