Dd is 3.5, we've been out and about today, went for lunch then a local fete where she went on a couple of fairground rides- no signs of being poorly, no runny nose or cough, eating fine, she's just woken up absolutely hysterical with a croupy sounding cough! She's in bed with me now and I can hear her breathing while she sleeps but no temp or anything, neither of my kids have ever had croup before- anything I can do to alleviate things now? Shall I open a window?