I'd say that time seems quite important to you right now; or at least you are being forced to believe it is important due to your life's routines, exams and deadlines et cetera... so perhaps your dreams are a kind of wish fulfilment where you can play around with time and do what you like at your own pace, even go backwards and do some things again, or go back to your childhood where none of these things that are currently on your mind even existed, where significant dates and times were always a long way off.
