According to a study by the Wheeling Jesuit University, Jasmine has a positive effect on the quality of sleep one gets, decreasing anxiety and improving the attitude one has after waking up. The smell of Jasmine doesn't make you sleep more, instead it makes your sleep time count for more. I guess you could consider it 'high quality' sleep with less moving and disturbance. In addition, studying while smelling Jasmine increased alertness and performance on cognitive tests."
I read this to Rafiki last night and he immediately said, "Bedtime!" :)