Cataplexy and Excessive Daytime Sleepiness can also be treated with with sodium oxybate such as Xyrem or Lumryz. Xyrem is a liquid taken at bedtime and generally four hours later, but only once at bedtime. It is very sedating, but short acting, meaning that patients typically do not have sleepiness or grogginess upon awakening the next morning. Lumryz is an extended release and is taken only at bedime once. Sodium oxybate has shown to improve nighttime quality of sleep, daytime alertness and cataplexy. Sedation and nausea are the most common side effects. Patients may also be prescribed Xywav, a low sodium oxybate which has less impact on the cardiovascular system. As with Xyrem, patients take their first dose at bedtime, and commonly, a second dose in the middle of the night. Xywav is not recommended for patients with liver problems since the body may not be able to break it down, resulting in an unhealthy built up.