Phenergan in my experince has caused paradoxical excitment as my GP put it. The children were uncontrollable and it does not work on overtired or jetlagged kids. The day after hangover from the drug lasted 3 days and it was an awful start to the holidays. I wish I never used it. I've travelled 28hrs with two children now and good planning and break is a better solution for all rather than a potential sleep of 8hrs that may or may not happen. THe nurses advice is the best.