Quviviq may cause serious side effects, including: See Important information. Worsening depression and suicidal thoughts. Call your healthcare provider right away if you have any worsening depression or thoughts of suicide or dying. Temporary inability to move or talk (sleep paralysis) for up to several minutes, or hallucinations while you are going to sleep or waking up. Complex sleep behaviors such as sleep-walking, sleep-driving, preparing and eating food, making phone calls, having sex or doing other activities while not fully awake that you may not remember the next morning. Stop taking Quviviq and call your healthcare provider right away if you experience a complex sleep behavior. The most common side effects include headache and sleepiness. These are not all of the possible side effects. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088