last night my 2 yrs 3 months old son woke up crying at 1 o'clock and was up till 5 in the morning.. is this normal? can this big child have a nightmare?

A. Crying of a Baby is mostly and commonly because of infantile colic and gas related discomfort which can be relieved by giving medicines like collicaid /gastica drops. other reasons could be nose blockage, pain in the ear or any other part of the body, you 3diaper rash and may be more other reasons which needs to be ruled out . babies may also cry due to hunger or feeling sleepy, emotional fear and seperation anxiety with parents ,just for stubborn hness for a wish or due to uncomfortable temperature and clothes ,so accordingly may be judged. if the crying behaviour doesnot resolve in time you should visit doctor for proper guidance.