That is interesting Liz. DS's symptoms are only at night. He goes to bed with a runny nose and sore throat (no cough or wheezing) and wakes up after an hour and a half with full-on croup (stridor, struggling to breath, panicking, unable to swallow). We calm him down, give him predmix and Nurofen and within 20 minutes to half an hour he us fast asleep and sleeps soundly until the next morning. During the day he doesn't cough and usually doesn't wheeze, but that could be because of the predmix. Would you mind describing your son's symptoms? I have been wondering about the difference between the two as well...