Felt jerk while sleeping. To cure this?

Hello Sir, My father recently felt sudden jerk while sleeping and got awake due to that. He felt as if he died at the moment. MRI of Brain and EEG were conducted upon recommendation of neurosurgeon. MRI report says "Diffuse Brain Parenchymal Shrinkage changes, consistent with patient's age" EEG report & MRI along with plate is also attached herewith for reference. So is it serious thing to be worried about? What was that shock type of situation, How did it happen? Why does it happen? What can happen in future if untreated..and whether it will get completely cured with medicines? What is the treatment options for this? What other additional tests are recommended to rule out anything suspicious happening in brain? What can be other risks that we should be aware of? How to tackle if such thing happens agains? What type of food is recommended parallelly to include in diet to cure this? His age is 60 No dibetes No disease prevailing as such No heart problem No kidney problem