Wishes are made when a clock is at 11:11 because the numbers 11 and 1111 are considered to represent new beginnings as well as moments of oneness. Numerologists and new age practitioners place emphasis on the numbers 11 and 1111 for this reason.
The concept of synchronicity is associated with that of oneness. Synchronicity is the experience of more than one event being related in a meaningful way. For example, glancing at a clock when it reads 11:11 is not something that occurs by happenstance. As a result, the potential for wish fulfillment enhances. The specific origins surrounding the importance of 11 and 1111 are not particularly known.