He threw up

Last night I put my children to bed early to sleep but after a few hours my son woke up coughing and he threw up all over the bed. He threw up a lot it was a good thing that my husband was home he changed all the beddings because I was busy on the computer. But it was okay because now I have to wash the beddings, blankets and the comforter. I do not know why he threw up I thought he only ate waffles last night for his dinner. This morning while he was eating his breakfast he saw the dirty beddings he said “I am sorry mama that I threw up” I said no it is okay you never did it in purpose and he said no. He is so sweet he was worried that I might ask him to wash the beddings.