What Causes Uncontrollable Urge To Close Eyes Despite Having Proper Sleep?
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Detailed Answer:
I read your question carefully and I understand your concern.
The answer to your question is not so straightforward. That is because there can be several causes to that fatigue you describe.
Anemia is a common cause which is often under-recognized.
Metabolic issues such as diabetes, thyroid hormone deficit, liver or kidney issues, addison's disease can also manifest this way.
Some neurological disorders such as myasthenia gravis present with palpebral muscle weakness and fatigue.
Sleep apnea is another common issue manifesting with daytime fatigue (but usually in overweight people or those with nasal malformation who snore at night, so if not your case it's unlikely).
So given the many possible causes some tests are necessary, starting with more routine ones which can be easily prescribed by your primary physician, such as blood count, inflammation markers (ESR, CRP), blood glucose, liver and kidney function, electrolytes, thyroid function. If all results normal and the symptoms persist then a neurological visit to check for other neurological signs may be necessary.
I remain at your disposal for further questions.