There may be a chronic infection. It can start after the flu and last for months or even years. Some kind of hidden inflammatory process. The body keeps it "under control", but it cannot reverse the situation and resolve the issue. First, energy is wasted on it. Secondly, I once read somewhere, - the remains of foreign microorganisms, destroyed by the immune system, "half-eaten" by our phagocytes, circulate in the blood or intercellular fluid and act as a kind of hypnotic. There is some kind of specific protein. The body needs help. Take the tests and, based on the results, decide what to do. And so, if you act at random - you can drink echinacea, propolis tincture, ascorbic acid, fish oil, or cod liver, that's all ... From experience, a doctor prescribed homeopathic drops to someone in our family. Well, they're not really homeopathic. There are two components: echinacea in some minus tenths of concentration and a very real alcoholic tincture of propolis. But the thing is really good. EDAS-150 is called "in inflammatory diseases of various etiology", as it says in the indications. I am not campaigning for homeopathy here, I just shared my personal experience. If anyone wants to pardon - you can, do not overwork only your finger ..))
1) Are you comfortable? maybe you have to get up during periods of deep sleep? when it feels like you are wading through the water? Then you need to change the mode, try to shift the time an hour earlier / later, use special applications for your phone that wake you up in the correct phase yourself.
2) it may be the thyroid gland. Constant fatigue and drowsiness is one of the signs of iodine deficiency, try to take a blood test for the thyroid gland.
3) another possible option is anemia, in principle, detailed blood biochemistry should reliably show whether everything is in order with the metabolism and the presence of macro and microelements in the body.
4) there is another option with depression or neurosis, when the sad circumstances of life cause a subconscious desire to escape and forget, sleep is quite suitable for this.
Drowsiness, fatigue are possible signs of low blood pressure. But in any case, if you are lethargic, you need to go to bed early and eat healthy food. The doctor also advised me to drink eleuthorococcus tincture.