why do i feel sick when i wake up

Feeling sick when waking up can be caused by multiple factors including irregular sleep, low blood sugar, acid reflux, dehydration, anxiety, and stress. Disrupted sleep cycles or insufficient sleep can upset the digestive system and hormone balance impacting nausea. Low blood sugar after many hours without food, especially if dinner was skipped, may cause weakness and nausea. Acid reflux can cause stomach acid to flow into the esophagus while lying down at night, leading to heartburn and nausea in the morning. Dehydration from lack of fluid intake overnight or alcohol consumption can also provoke nausea. Anxiety or stress triggers hormones that affect digestion and cause stomach upset. In summary, feeling sick upon waking is often linked to these common causes, and addressing sleep quality, hydration, diet, and stress levels can help alleviate morning nausea.