Physically...emotionally drained...?

well my dad. my brother and I had a very eventful day. my dad drowned in a deep river and kyle and I saved him...coast guard was called police were waiting for us. helicopters were in the air. as I held my dad telling him that I loved him after I got his head to the surface (there was no shore in sight) and well hes alright now. but during that time. I was thinking logically how to help my dad and my brother as my dad has halance issues and my bro has more emotional and physical issues. and he also cant swim to well. and I was the only one that had a life vest but I was a good 50 feet ahead. Luckily I use to be on the swim team and got there faster then I can even imagine. and got my dad out in time. but seeing him so lifeless going in and out of conciouaness. while we struggled to hold him up. scared my little brother a lot. he is fine. thank you god so much. but after we all got checked out. and now were home. my little brother is passed out. has been for hours. and my dad and I are so drained and tired. we actually are going to bed soon. why is this... that we feel so tired and like we want to sleep for a day. and live life to the fullest?