“Why do my eyes feel tired even after sleeping?”

There could be many reasons for your eyes "feeling tired even after sleeping." You could have allergies to a pet that shares your bed or pillow, meibomian gland dysfunction, dry eye, uncorrected refractive error, or other issues. If you feel that this is a significant problem, then a complete eye exam likely with dilation would be beneficial in determining the cause.

That could be secondary to many different issues. You should see an eye care professional to determine what is the most likely cause.

It may not be an ocular problem. But I would definitely get a comprehensive eye exam to start.