This 15 mins Breath For Sleep audio session is best listened to with headphones if you have them (but no worries if you don't).  The accompanying music has been chosen for its frequency. The frequency here is Delta, which are linked with immunity, healing, and deep sleep. Delta waves are known for their positive influence on your quality of sleep, most notably for people suffering from insomnia. They allow the brain to synchronize itself and create the ideal state to sleep well, so you'll wake rested and with enough energy to start your day. Delta frequencies can also restore your mental and emotional balance, by reducing anxiety and any negative reaction due to stress. They're also very effective for people who suffer from migraines. So you're getting a double whammy here - all the benefits of the breath and all the benefits of the Delta waves! Just to note on the 15 mins version there is a slight background hum - that's not your headphones, it's all part of the healing process ;)