Alice in Wonderland syndrome  Alice in Wonderland syndrome (AIWS), also known as Todd's syndrome or dysmetropsia, is a neuropsychological condition that causes a distortion of perception. People may experience distortions in visual perception of objects such as appearing smaller (micropsia) or larger (macropsia), or appearing to be closer (pelopsia) or farther (teleopsia) away than they actually are. Distortion may occur for other senses besides vision as well. Alice in Wonderland Syndrome (AIWS) is often associated with migraines, brain tumors, and psychoactive drug use. It can also be the initial symptom of the Epstein–Barr virus (see Epstein-Barr virus-associated lymphoproliferative diseases). AiWS can be caused by abnormal amounts of electrical activity resulting in abnormal blood flow in the parts of the brain that process visual perception and texture. Anecdotal reports suggest that the symptoms of mononucleosis commonly occur as AiWS in childhood, with many people growing out of it in their teen years. It appears that AiWS is also a common experience during sleep onset and has been known to commonly arise due to a lack of sleep. AIWS affects the sense of vision, sensation, touch, and hearing, as well as the perception of one's own body image. Migraines, nausea, dizziness, and agitation are also commonly associated symptoms with Alice in Wonderland Syndrome. Less frequent symptoms also include loss of limb control and dis-coordination, memory loss, lingering touch and sound sensations, and emotional instability. Individuals with AIWS can experience hallucinations or illusions of expansion, reduction or distortion of their own body image, such as "microsomatognosia" (feeling that their own body or body parts are shrinking), or "macrosomatognosia" (feeling that their body or body parts are growing taller or larger). These changes in perception are collectively known as metamorphosias, or Lilliputian hallucinations, which refers to objects appearing either smaller or larger than reality. People with certain neurological diseases have also experienced similar visual hallucinations. Within the category of Lilliputian hallucinations, patients may experience either micropsia or macropsia. Micropsia is an abnormal visual condition, usually occurring in the context of visual hallucination, in which the affected person sees objects as being smaller than they are in reality. Macropsia is a condition where the individual sees everything larger than it actually is.