In contrast to the earlier reports about pre-schoolers not reading enough, now here’s a report about the admittedly incredibly small phenomenon of “Hogwarts headaches.”
A pediatrician says he had three otherwise healthy children complain of headaches for two to three days last summer. It turns out all had been reading the 870-page “Harry Potter and the Order of the Phoenix” in marathon sessions.
The original source
Bennett HJ. Hogwarts headaches — misery for muggles. N Engl J Med. 2003;49(18):1779.