Laylat al-Qadr, or the “Night of Power,” is an Islamic observance during the last ten nights of Ramadan that commemorates the first revelation of the Qur'an to the Prophet Muhammad. It is considered the holiest night of the year, when prayers, charity, and acts of devotion are believed to carry especially great spiritual reward. The exact date is debated; many traditions observe it on the 27th night of Ramadan, but others hold that its precise timing is unknown and may fall on any of the last ten nights.