I feel sleepy in the morning. It does not matter how much or how good i sleep at night but i feel very sleepy and unable to wake up and study. Usually it does not happen after evening. I also had vitamin d deficiency but it's at sufficient level now after taking medicines for that. I don't know the other reason for that. Also, i think i also have a little sinus problem as i feel a bit difficult to breathe from my right side nose and strain at the side of my right eye. My right brain also feels a bit clogged. I also have pain in my legs which i think was due to vitamin d deficiency.