Some devices can wake the system from a sleeping state when certain events occur.
The operating system need not be rebooted to return the computer to the working state. Unlike a system in the shutdown state (S5), however, a sleeping system retains memory state, either in RAM or on disk, as specified for each power state below in System hardware context sections. A system in one of these states is not performing any computational tasks and appears to be off. States S1, S2, S3, and S4 are the sleeping states.
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