Excessive stress, anxiety, and depression: If you suddenly start vomiting in the middle of the night without any other symptoms, think of anxiety and stress as the cause. Stress, anxiety, and depression are some of the main causes of unexplained vomiting in the middle of the night. Nausea is the feeling of wanting to be sick (vomit). Vomiting is when you are sick, or 'throw up'. The contents of your stomach rise up your food pipe (gullet, or oesophagus) and spill out of your mouth or nose. Nausea and vomiting are controlled by a combination of the vomiting centre in your brain, and areas within your gut. dBgYWX.

what causes vomiting in the middle of the night