My 2 year old has had about four or five extremely brief episodes of a croup-like cough over the past 6 months. Typically they have occurred in the middle of the night or first thing, last literally 5-10 minutes and then she is absolutely fine. No other symtoms. It has then been weeks/months later that another one occurs. Definitely a croup-like cough, we're not talking a chesty or dry one. It's so distinctive and quite upsetting to her when it's happening. Can anyone shed any light on what might be going on?