The aliens are coming

This dream was last week. I looked into the night sky and saw patterns being formed with light. The lights were forming the numeral 8, with circles at top and bottom with the crisscross lines between. I called Aaron to show him and told him that it was a sign of incoming aliens. I then was in the air, looking down at a track at groups of kids walking in formation and cyclists riding together. One by one they would disappear, taken by the aliens. I realized that straight lines were attracting the aliens and hurried to tell the groups to break up into un-even groups.