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 .
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 .