It is basically a softening of the brain matter as a result of an ischemia or infarction, degenerative changes, infection, craniocerebral trauma, or other injury. Thus any damage to this lobe can lead to
long term memory loss. Certain types of epilepsies and seizures and sleep disturbances too cause short term memory loss along with tiredness or fatigue. Chronic infections too are known to precipitate memory loss. For this you can try yoga and meditation.