Get a whiff of lemongrass! According to Stanford University, the scent of lemongrass boosts the brain’s production of sleep-inducing alpha waves within 5 minutes. That’s because the scent dampens activity in the part of the brain that controls tension and emotional outbursts. So, mix 3 drops of lemongrass essential oil with a little unscented lotion – and rub it into your neck and shoulders. It’ll help you drift off in no time.