I have seen them doing an ultra marathon on the second night of no sleep. It's weird how you brain fills so much detail in. The creatures I could see were like gollum from LoTR but with reptilian skin..they were either smoking pipes or playing elaborate music on instruments I have never seen before..
The non-fiction book "Why people believe weird things" begins with the author's recounting of his own meeting with aliens, during a coast-to-coast cycle race where he had gone without sleep.
In reality it was his crew trying to get him off his bike before he fell asleep and fell off
