This one is not a dream with a fully-developed plot but it reminded me of a time when I heard that we have a higher level of awareness during sleeping.
In the real world a parcel was supposed to be delivered to my house and the mailman phoned at about 9 AM that he'll be in an hour. I was still kind of tired, so I went back to sleep. I dreamed about going on a train and waiting for... a mailman to bring me a parcel. The train was going pretty fast but at one point it started reaching its stop and exactly at the moment when it arrived at a station and a mailman was supposed to get in, the real mailman knocked on my door and woke me up.
Premonitions... Wish I saw them so vividly each time.
