At the end of the procedure a flashing light may be placed nearby to see if this affects your brain activity. Sleep EEG or sleep-deprived EEG. A sleep EEG is carried out while you're asleep. It may be used if a routine EEG doesn't give enough information, or to test for sleep disorders.
This is all I could find on years...Prometheus was originally intended as a direct prequel to the 1979 science fiction horror film Alien, set approximately 30 years before the events depicted in the film. Alien supposedly takes place around 2122. Prometheus had a date of 2093 according to the intro.
Best Answer: Prometheus takes place 29 years before Alien. Ripley mentions a date of '79 to Burke referring to when he sent the colonists to check out the derelict (after hearing about what happened to her crew on the Nostromo) and subsequent infestation of the colony follows.