Gabapentin (Neurontin) promotes slow-wave sleep and is a safe and effective insomnia medication. It is a medicine that is commonly administered in neurology and psychiatry. It is used in neurology to treat seizures, neuropathic pain, migraines, and restless legs syndrome. It is also used in psychiatry for the treatment of anxiety disorders, such as panic disorder and obsessive-compulsive disorder. It has been reported to cause drowsiness but should not be taken before driving or operating machinery. Like other anticonvulsants, it can cause fatigue, nausea, diarrhea, constipation, dry mouth, increased appetite, weight gain, or depression. Increasing your dose or using it for longer than recommended may make you feel more tired than relieved. If you experience any side effects that cause concern, discuss these issues with your doctor so they can be addressed effectively. Neurontin (gabapentin) can help people who struggle with falling asleep or staying asleep. It is not approved for use as either a monotherapy (by itself) or as an adjunct (along with another drug) for patients with insomnia. However, it does appear to be effective when used with other medications for this purpose. In addition, gabapentin has been shown to improve daytime function when used to treat epilepsy or post-traumatic stress disorder (PTSD).