1. Be alert to cerebrovascular disease. The first thing you need to do is to make sure that you have a good idea of what you are doing. Over time, this can affect the normal function of the brain, resulting in drowsiness and other manifestations. These patients may also have a combination of dizziness, headache, and numbness and weakness in the limbs, which requires particular attention.
2. It may be a sign of heart disease. The brain is the body’s “commander” and controls the activities of all the body’s organs at all times. In general, about 1/5 of the blood pumped by the heart is used by brain tissue, so brain metabolism is greatly influenced by the contraction function of the heart. When middle-aged and elderly people suffer from heart disease, the blood pumped out from the heart will be reduced, and the brain will suffer from ischemia and hypoxia, which will cause symptoms such as mental fatigue and drowsiness.
3. Respiratory sleep apnea syndrome. This disease is mostly seen in middle-aged and older men who are obese and have bad habits such as alcohol abuse. They can suffer from temporary asphyxia during sleep due to poor breathing. Snoring is one of the most typical symptoms, which usually manifests as loud but irregular snoring, intermittent, and high and low sounds. Because they can’t get to sleep completely, they don’t get enough rest even if they sleep for a long time at night, and they will show no energy, tiredness and drowsiness during the day.
4. Hypothyroidism (commonly known as “hypothyroidism”) is also often characterized by sleepiness and drowsiness. This is mainly due to a malfunction of the thyroid gland, which reduces the synthesis and secretion of thyroid hormones. They may also present with laziness and reluctance to move, swollen limbs, memory and mental retardation, and unresponsiveness.
5. In addition, drowsiness can be a sign of chronic diseases such as dyslipidemia, diabetes, chronic nephritis, and chronic liver disease; some depressed patients have trouble sleeping at night, and it is common for them to be sleepy and doze off during the day.