Should be caffeine banned in sports?

The Australian Olympic Committee (AOC) claims that caffeine should be included in banned drugs of the World Anti-Doping Agency. The president of the AOC John Coates notes that caffeine promotes addiction to sleeping tablets and tranquillisers.
It is known that the Australian swimmers who took part at the 2004 and 2008 Olympics used sleeping pills Stilnox. So, Coates believes that usage of caffeine led to intake of Stilnox.
Stilnox is ordinarily sold under the name Zolpidem. It is a sleeping remedy that is used in case of insomnia.
The president of AOC notes that athletes use caffeine for its effects on performance. Usage of this substance causes insomnia. So, sportspersons should use sleeping tablets in order to cure insomnia.
 The AOC and Swimming Australia desire to prohibit usage of caffeine. It is their response to the disgraceful case related to Grant Hackett. A physician recommended using Stilnox to this athlete at the time of the 2003 World Championships. As a result, this swimmer became addicted to this sleeping remedy.
Grant Hackett is a famous swimmer. He won numerous competitions, including the 2000 Sydney Olympics, the 2004 Athens Olympics and the 2008 Beijing Olympics.
Alan Thompson, the former coach of the Australian Olympic Team, has also confirmed that intake of Stilnox is widely spread among Australian swimmers.
Stilnox was never on the list of prohibited products. Anti-doping agencies didn’t conduct tests to disclose usage of this medicine.
But when it comes to caffeine, previously it was banned by the WADA. But since it became widely spread and used in society, it was excluded from the list of banned products.
John Fahey, the president of the WADA, confirms that the WADA made the right decision and excluded caffeine from list of forbidden preparations. He claimed that caffeine would not be included in the list of banned drugs again.
However numerous specialists state that caffeine is a performance enhancer, John Fahey contests this statement. He affirms that caffeine doesn’t impact on performance. John Fahey concludes that no any scientific literature describes capacity of caffeine to enhance performance.