Waking up in the morning with nausea has been linked to a number of conditions, such as indigestion, gastritis, staying up late, reflux esophagitis, and of course an early pregnancy reaction. Early pregnancy reactions are varied and can include dizziness, weakness, drowsiness, loss of appetite, nausea, and vomiting. To check if you are pregnant, you can use early pregnancy test strips to test your morning urine or go to the hospital for a blood HCG test. If both of these pregnancy tests rule out pregnancy, then it is definitely not related to pregnancy. The most common cause of nausea in the morning is digestive disorders, such as gastroenteritis and indigestion. Therefore, it is best to go to the hospital at this time and ask a gastroenterologist to help diagnose the problem.