Why is it that sometimes you feel an overbearing urge to write.

Hypergraphia is "the driving compulsion to write; the overwhelming urge to write. Hypergraphia may compel someone to keep a voluminous journal, to jot off frequent letters to the editor, to write on toilet paper if nothing else is available, and perhaps even to compile a dictionary.

Hypergraphia is the opposite of writer's block. Temporal lobe epilepsy (TLP) is associated with hypergraphia. This association has been known at least as early as 1974 (Waxman SG, Geschwind N. Hypergraphia in temporal lobe epilepsy. Neurology. 1974; 24:629-36).

A number of prolific writers may have had TLP, including Byron, Dante, Dostoevsky, Molière, Petrarch, Poe, and Tennyson." (http://www.medterms.com/script/main/art.asp?articlekey=26483).

It has even been suggested that writers of religious scriptures may have had TLP and consequently exhibited hypergraphia.

A phenomenon similar to MSI, but positive in its effects, occurs in many religions when entire congregations are seized by mass sociogenic euphoria as happens among Kali worshippers, Hari Krishna devotees, Pentecostal Christians, Charismatic Catholics and Sufi Muslims, to name just a few.

Auditory stimuli in the form of singing, music, clapping hands, beating drums and dynamic preaching can trigger mass sociogenic euphoria and under its effects persons have been temporarily ‘healed’ of various ailments.