By definition, Swing Traders/Trading is a style of trading that attempts to capture short to medium-term gains in the asset being traded. Primarily using Technical Analysis, Swing Trades can last anywhere from a matter of days, to weeks and sometimes months if the underlying trends continue.
Because of the duration of these trades, Swing Traders have to develop the necessary skill to withstand the "push-retrace" mechanism of price movement, in addition to having active trades while you sleep. This would be one of the primary reasons why traders opt for a different style of trading to Swing Trading, as the strength of mind required to withstand the emotional aspects of Swing Trading can be significant.