Alice in Wonderland Syndrome (AIWS or AWS) describes a set of symptoms, the most famous of which are:

• Alteration of body image: the sizes of parts of the body are perceived incorrectly.
  
• Alteration of visual perception: the sizes of external objects are perceived incorrectly.

Most reports are about children experiencing AIWS symptoms, though many people experience it in later life. Many people say they had AIWS symptoms as a child, but 'grew out' of them around their teens.

The most common time to experience AIWS symptoms is at night.