Webwhat causes nausea at night? There can be numerous reasons that you wake up overnight—or can’t fall asleep—due to feeling queasy. These are the most. Webthere are some illnesses and symptoms that tend to strike at night that have less to do with the time of the day, and more to do with what you tend to do come. Webnausea at night is usually a symptom of an underlying condition. Some of the most common causes include acid reflux, anxiety, medication side effects, peptic ulcers, or pregnancy. Webnighttime nausea is a symptom of various conditions, including pregnancy, anxiety, side effects of medications, gerd, and gastroparesis. Webwhile nausea is a recognized symptom of sleep deprivation and disrupted sleep, scientists are still learning more about this connection.