Hi Welcome to the HCM I have gone through your question and understand your concern. The symptoms can occur due to gastritis associated with overnight fasting or it may be a form of juvenile myoclonic epilepsy. The hallmark characteristics of juvenile myoclonic epilepsy are the presence of myoclonic jerks that occur on awakening from sleep either in the morning or from a nap. They are typically described as shock-like, irregular and arrhythmic movements of both arms. Sometimes these movements are restricted only to the fingers making the patient or individual look clumsy or prone to dropping things. They are precipitated by alcohol intake, stress and sleep deprivation. If you feel that the episodes are associated with above mentioned symptoms, then an electroencephalogram (EEG) will be useful to detect any occult epilepsy. Else, you may start antacids for him to relieve gastric acidity which might be the cause of these episodes of vomiting. Hopefully this will help you. Take care