It means go to bed. Mattresses were once stuffed with hay or straw, so the image is ofyou flopping down on your mattress and hitting the hay.
Causes. There is no known single cause for autism spectrum disorder, but it is generally accepted that it is caused by abnormalities in brain structure or function. Brain scans show differences in the shape and structure of the brain in children with autism compared to in neurotypical children.auses. There is no known single cause for autism spectrum disorder, but it is generally accepted that it is caused by abnormalities in brain structure or function. Brain scans show differences in the shape and structure of the brain in children with autism compared to in neurotypical children.
Abstract. Characterized by a combination of abnormalities in language, social cognition, and mental flexibility, autism is not a single disorder, but a neurodevelopmental syndrome commonly referred to as autism spectrum disorder (ASD).utism genetics: a decade of progress. In many ways, autism is a mysterious disorder, as it involves core abnormalities in social cognition and language, both of which are central to what makes us human.