Provided is a functional learning/training device and methods for forming a sleeping function, which is distinct and independent of general sleeping function, and which enables the user to fall asleep quickly by overcoming the phenomenon of insomnia. When a new sleeping condition is set by actively generating visual activity every night, the phenomenon of insomnia may be solved, such that the user can fall sleep quickly and further, ultimately, with the use of the newly formed sleeping function, even without the use of the present invention, the user can solve the phenomenon of insomnia easily and fall asleep, as if a normal person sleeps in a general sleeping function under general circumstances.