Circle contact lenses should not to be worn while sleeping because this can lead to eye infections, and you should let your eyes at rest when sleeping, what is not possible if you don’t remove your contact lenses.
About wearing contact lens when swimming, it depends if you swim in the sea or in a swimming pool. There is no real problem to wear circle lens when swimming in the sea if you don’t put your eyes underwater and if you avoid splashing water into your eyes, but when swimming in a swimming pool it is advisable not to wear contact lenses because the chlorine in the water can damage the lenses and hurt your eyes too.
In any case it is better to wear swimming glasses to avoid any contact between water and your color lenses.
Sleeping with Korean color lenses should always be avoided, even for a short nap, and swimming with contact lenses is possible but not recommended.
By following some important rules you will avoid any problem that only people who do not take care of their contact lenses can face.