Using the Qur'an As A Pillow
Question :
In some Masjids, one sees people lying down, resting their heads on the Qur'an; is this permissible?
Answer:
There is no doubt that using the Qur'an as a pillow is not just unlawful, but also a great sin. Muslims must protect the Qur'an from debasement and from those who are ignorant about the sanctity of the Qur'an, just as they must protect the Masjids from the evil behavior of such people, or they must keep the Mushaf in an elevated location away from these ignorant disobedient people.
Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 7 Page 74