Lights in the sky do not impress me. I am not really interested in those types of reports, unless they involve some type of physiological or psychological effect upon the percipient(s). My main area of interest is the occupant encounter, or Close Encounter of the Third Kind (CE-III) as classified by Dr. J. Allen Hynek. Reports involving "ufonauts" have existed since the 50's. Fortunately, researchers such as Jacques Vallee and Dr. Hynek got involved early on with investigating these reports. We now have thousands of reports from individuals claiming to have seen these beings or been in contact with them, whether intentional or not. Then you have the abduction accounts, which have drawn considerable criticism - most of it warranted, in my opinion.
I did a very high level study of these accounts, taking into consideration the source who reported it and the UFOlogist who documented it. Many of the cases I found to be truly unexplainable were well documented at the time and often times involved either a psychological profile of the witness and/or a physical exam. Below is a chart showing the consistencies between reports spanning multiple decades.
A Sampling of Thirty Cases (1947-1993)
The chart above indicates the UFO occupants generally are seen wearing tight fitting clothes, similar to diver's suits. For the most part, they do try to avoid contact with humans. When contact is inevitable they are reported to use some type of hand held device to paralyze us. Most of these occupants are smaller than the average human, standing roughly 3 to 4 feet tall.
Reports involving paralysis are fairly consistent across the board in terms of 'how' the person is paralyzed. The entity or UFO emits a light towards the human and paralysis sets in. The person is often left fully aware, consciousness left intact.