Chest pain with excessive sweating in the early morning may sometimes be related to heart conditions such as angina or even a heart attack, especially if it is severe or recurring. Other possible causes include acid reflux, anxiety, or low blood sugar levels during the night. Less commonly, sleep-related conditions or high blood pressure spikes may also contribute to these symptoms. Because chest pain can be serious, it is important not to ignore these symptoms. You should seek medical attention immediately if the pain is severe, lasts more than a few minutes, or is associated with breathlessness or dizziness.