Comedown (drugs)
The comedown, or crashing (also "down", "low", or sometimes "crash"), is a phase of drug withdrawal that involves the deterioration in mood and energy that occurs when a psychoactive drug, typically a stimulant, clears from the blood in the bloodstream. The improvement and deterioration of mood (euphoria and dysphoria) are represented in the cognitive schema as high and low elevations; thus, after the drug has elevated the mood (a state known as a high), there follows a period of coming back down, which often has a distinct character from withdrawal in stimulants.