'If you don't succeed at first, try try again.'
This phrase is all too familiar to most of us. When you think about time travel, it becomes even more familiar. With time travel, you could revisit one point in time over and over again.
Do you remember the movie 'Groundhog Day'? This would actually be possible if time travel were a reality. We could regress to any point of time over and over, but unlike Bill Murray, we would not retain our memories of the past day.