My 19 Yr Old Grandson Just Called And Said He

My 19 yr old grandson just called and said he is having memory loss and confusion. I asked if he was taking drugs of any kind and he said No. He said he is drinking alot of coffee to stay awake during class. Can too much caffine cause imbalance and short term memory loss? I told him to avoid too much coffee and go the infirmary his school. He said he cannot sleep when he does go to bed..it was after midnight when he called me.