I do not disagree with the case of missing time.
That said, missing time is a standard part of everyone's day as they drift off into sleep, have no memory of drive thru a Red Light, driving with no memory of the last 10, 20, 30 miles, or in a meeting and have no memory of what was said, etc...
The important events are when within the missing time, there are memories, but not within the individuals normal preview. Memories of individuals, or creatures not common to them -or- occurrences that are not comfortable or down right scary...
Sadly, for far too long, government (in general) have attempted to cover or mis-direct the occurrences of individuals who experience these occurrences. In addition, government has experimented on its population that are known to cause this type of belief.
I have never seen a UFO and based on extensive time in the open conditions of the Great Lakes at Night and in the day time, something should have shown up.
When one considers the age of our plant and the much greater age of the Universe, near everything is possible.