Transient global amnesia (TGA) is a neurological disorder whose key defining characteristic is a temporary but almost total disruption of short-term memory with a range of problems accessing older memories. A person in a state of TGA exhibits no other signs of impaired cognitive functioning but recalls only the last few moments of consciousness, as well as possibly a few deeply encoded facts of the individual's past, such as their childhood, family, or home perhaps.“

Source : Wikipedia

It's usually fairly short lasting; typically 2 - 8 hours. It's known that various triggers can lead to TGA episodes - such as: vigorous exercise - trauma - migraine - intoxicants - epilepsy etc.

The underlying psycho-neural mechanisms which lead to an attack, and the way in which sufferers typically make a complete recovery in a few hours, is unknown.

Also see: Memoryplugin-autotooltip__plain plugin-autotooltip_bigMemory

"Although it is commonly accepted that learning and memory occur via enduring changes in neuronal properties such as synaptic strength within a network of neurons, many details of these processes remain unknown, including the mechanisms responsible for the pers… and Hangoverplugin-autotooltip__plain plugin-autotooltip_bigHangover

Despite its ubiquity and history spanning several thousand years, the understanding of alcohol-induced 'Hangover' is limited.

"Alcohol hangover is characterized by adverse physical and mental effects that occur the next morning after the intake of toxic dose…

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