Microsoft appears to be deprecating sleep in favor of Modern Standby, in which the machine draws enough juice to download and install updates. You know, because

Microsoft appears to be deprecating sleep in favor of Modern Standby, in which the machine draws enough juice to download and install updates. You know, because Windows is a service, and your contract with the network when you get the show is you're going to install the updates. Modern Standby is a low-power variant of S0, the normal "awake", "computer is on" state. Because what a PC is is defined largely by the needs of Windows, many systems shipping today do not support the deeper power states (S1-S3) at all, just Modern Standby.