[quote= http://msdn.microsoft.com/en-us/library/windows/hardware/dn495346(v=vs.85).aspx]Connected standby SleepStudy Starting with Windows 8.1, a software tool, SleepStudy, is available as an inbox component in all Windows PCs that implement the connected standby power model. SleepStudy can measure connected standby performance with minimal impact. Watch this video to learn how to use SleepStudy to find and fix components that cause unexpected battery drain. Tracking system activity and battery drain during connected standby can be difficult because the tracking itself can cause unnecessary activity and battery drain. For example, traditional disk-based logging has the unwanted side effect of causing excessive battery usage when the disk is activated for logging. In contrast, the SleepStudy tool is designed to avoid generating activity that could interfere with the connected standby performance that it measures.