I have myopia i realized that when i wear glasses at evening(night) get headache.i dont have pain when wearin at afternoon why do this happen ?

Check again: Get another exam and be sure to tell the doctor your problem. The glasses need to be changed a little. During the day, a smaller pupil blocks rays of light that need to be bent more. That allows you to get by with a prescription that is not perfect. With a larger pupil in dim light, more rays of light enter. The imperfection in the Rx becomes more noticeable.