Dream or Real?

Last night I woke up rather voilently because I thought I heard someone banging on the front door then repeatly hitting the doorbell. It takes me more than a few seconds to get out of bed now because of the CPAP machine which had been knocked to the floor. April and I went to look out the front window and we did see a car. No one else heard the knock and Becca did not bark as she normally does when someone knocks. So was it real or not? I don't know.