Websee your doctor urgently (within a few days) if you develop 'red flag' symptoms. See your doctor if your vomiting lasts for more than 48 hours and is not. Webbased on the limited, existing literature, we recommend that in order to reduce the risk of injuries and possibly breast cancer, night shift schedules have: 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,. Webnighttime nausea is a symptom of various conditions, including pregnancy, anxiety, side effects of medications, gerd, and gastroparesis.