My symptoms are little blurring of vision, light headache and hypersomnia..what can be the reasons.?

The most likely...: ....Reason is sleep deprivation. Maybe you need more hours, or maybe you are not sleeping well. Many young people think they can get by on too few hours, when actually they are suffering the effects of too little sleep. You can cheat sleep and you can't pay it back. Your body requires the amount of sleep it requires. Look to this first as the cause.

Depends: Blurry vision with headaches can be due to: migraines, new onset diabetes, fevers, viruses (lyme, etc), autoimmune disorder, increased intracranial pressure/papilledema, brain tumor. An eye md can take a look under the microscope to make sure you do not have inflammation in the eye and also take a look at your optic nerve to be sure is normal and all it is a type of migraine.