Music is more than fun. It has a direct effect on the parasympathetic nervous system, which relaxes your body and prepares for sleep. Older and younger adults who listen to 45 minutes of relaxing music before bedsleep sleep longer, get up less at night and rate their nights as more relaxing than if they don’t listen to music. It’s not a fantasy. Music has the power to slow heart rate and breathing, lower blood pressure and even stimulate muscles to relax.