Shuteye Virus

The Shuteye Virus (name varies due to different language names/nicknames) was a worldwide event starting from mid 2022 and ended sometime in the 2100s; possibly 2102. More than 50% of the worldwide population had died within the first year of the virus outbreak, though this number remains unknown by the time of the 2030s and 2100s.

History
Originating in Central Asia in the 2000s, the virus mostly remained unknown and in small cases until 2021. It was a mutation of an unknown virus that had leaped onto humans from an unidentified animal. In late 2021, the virus had reached China and other East Asian nations, eventually starting the known and established "Shuteye Apocalypse".

Originally, the virus lived among every human (except for a few unmarked immune humans) for the duration of much of the apocalypse, until about 50 years in (2070s) where the virus collectively died and leaped onto the next animal; later confirmed to be rodents. After the 2070s, the shuteye population casually decomposed to death until the 2100s; where no more remained.