After sleeping on your side, one earphone may be blocked due to pillow obstruction, resulting in Bluetooth disconnection. 2. Sleeping on your side at a certain angle causes the ear tips to be offset and block the earbuds, resulting in no sound or low sound. We recommend you try the following: 1. Adjust the positioning of your head and pillow. 2. Try larger ear tips. 3. Use a Q-tip with a bit of rubbing alcohol to gently clean the metal mesh filter under the rubber ear tips.