CES Sleep Aid Insomnia Electrotherapy Device Anxiety and Depression Migraine Relieve Anxiety Head Pain Fast Sleep Instrument. This sleep aid uses CES therapy to scientifically guide sleep and effectively improve anxiety, post-traumatic stress disorder and insomnia by gently stimulating the brain. It has three modes, nine adjustable gears, and a built-in 1000mAh lithium battery. The device is easy to use, comfortable, and portable, making it suitable for people who are stressed, prone to anxiety and depression, and have difficulty falling asleep.