Symptoms of my son...He is 29 years old. His fiancée called and said he pulled an all-nighter last night due to work and was up all day until around 5 tonight. They had sex and he fainted, couldn't stand, couldn't see. He didn't eat much today so she made him a sandwich and gave him some water. She had to help him to the bathroom where he wound up vomiting. He went to bed and fell asleep. He is only responding to questions with the answers, "I'll be fine" and I'll be ready in 5 minutes". He won't drink much water. I went over there to check on him and he will not wake up enough to talk to me other than to answer as above. Could these symptoms be because he is just overly tired?