Yes, it is normal. When one feels tired after a long time of work, it is likely that his eyes appear red. There are many tiny blood vessels on the surface of the eyes, when the amount of oxygen in the cornea or tissues of the eyes is not sufficient, the blood vessels become inflamed, hence the eyes appear red. You should have a good rest and relax yourself. After a period time of work, you should rest your eyes for at least 10 minutes. You can apply warm compresses over your eyes. Also, you can place a cool, wet rag over your eyes to relieve eyestrain. You can drip some eye drops to soothe your eyes, too.
When you are so tired because of the long time sit in front of the computers, your red eyes are reasonable because of the stimulation of the eye nerves and eye pressure. It is not normal. You should use some eye drops to release the symptom. You could also do the warm compress to make the eyes feel comfortable.
Well, yes, it is normal to have red eyes, when you are tired. Generally speaking, when your eyes are tired, your eye pressure will be high and then, eye strain may occur. And in that way, it can just lead to a lot of eye problems, such as red eyes, bloodshot eyes, even dry eyes. And when you suffer red eyes, your eyes will feel itchy, dry, and painful and discomfort. For your situation, you can make an eye pack made from chilled cucumber slices. Just put those under your eyes, and it may be very beneficial. Of course, you should have a good rest and then, it will be fine. Anyway, just be relaxed and then the redness will disappear by itself.