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.
The opening tells us that the date is 358 BC, yet the cultures and governments depicted in the movie are typical of a much earlier time, possibly even 1358 BC. One of the most telling details is that Eurystheus is called the King of Athens, an office abolished at least 400 years earlier when Athens became a republic.