High blood sugar (hyperglycemia) can cause symptoms at any time of day, but some people notice them more at night because they interfere with sleep or become more noticeable when they’re resting. There isn’t a specific rule that symptoms worsen after 10 p.m.
Common symptoms of hyperglycemia include:
- Frequent urination, including waking up several times at night to urinate.
- Excessive thirst, even after drinking fluids.
- Dry mouth.
- Fatigue or feeling unusually tired.
- Blurred vision.
- Headache.
- Restless sleep due to thirst, urination, or feeling unwell.
Other signs of persistently high blood sugar can include:
- Increased hunger.
- Slow-healing cuts or sores.
- Frequent infections.
- Unexplained weight loss (more common in untreated Type 1 Diabetes, but it can also occur with severe Type 2 Diabetes).
If blood sugar becomes very high, symptoms may include nausea, vomiting, abdominal pain, rapid or deep breathing, confusion, or extreme drowsiness. These can be signs of serious conditions such as Diabetic ketoacidosis or Hyperosmolar hyperglycemic state and require immediate medical care.
If you’re waking frequently to urinate or feeling very thirsty at night, it’s a good idea to discuss these symptoms with a healthcare professional. They may recommend checking your blood glucose or performing tests such as a fasting blood glucose or an HbA1c test to evaluate for diabetes.
If you’re experiencing these symptoms, tell me:
- Your age.
- Whether you have already been diagnosed with diabetes.
- Whether you’re waking up thirsty, needing to urinate, or both.
