Dilated pupils, higher body temperature, increased heart rate and blood pressure, sweating, loss of appetite, sleeplessness, dry mouth, and tremors. While under the influence, the user may suffer impaired depth and time perception accompanied by: distorted perception of shape and size of objects, movements, colors, sound, touch, and the user’s own body image. The ability to make sound judgments and see common dangers is impaired, making the user susceptible to personal injury. It is possible for users to suffer acute anxiety and depression after an LSD “trip.” Hallucinogen Persisting Perception Disorder, which may include fragmentary recurrences of certain aspects of the drug experience or “flashbacks” have been reported days, and even months, after taking the last dose.