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For that, we’ll turn to Event Viewer, a handy logging tool that will help us see when your computer turned off (be that because it was shut down, put to sleep, or hibernated) and when it woke up. While the Command Prompt command we just talked about is great for showing you what last woke your PC, sometimes you need to go a bit further back in history to see what’s woken it up before. RELATED: Using Event Viewer to Troubleshoot Problems

Explore Other Wake Up Events with Event Viewer This won’t always give you the information you need, but often it will. You may also see listed devices-like your mouse, keyboard, or network adapter-or events like wake timers or automatic maintenance. I can tell from the output of the command above, for example, that I used the power button to wake my PC. In the Command Prompt window, type the following command and press Enter: powercfg -lastwake Start the Command Prompt by hitting Start, typing “command,” and then selecting the “Command Prompt” app. You can usually figure out what event caused your computer to wake up most recently with a simple Command Prompt command.

The first step in figuring out why your PC is waking up before you want it to is determining what’s doing the waking. There are a few different steps you’ll probably need to take here, as no one solution fits everyone. RELATED: PSA: Don't Shut Down Your Computer, Just Use Sleep (or Hibernation) How to Find Out What’s Waking Your PC Upīefore you can fix the problem, you need to determine the problem.

Scheduled tasks can also be configured to wake the PC up so that they can run. One of the differences between sleep and hibernation is that when a PC is alseep, activity from certain devices can wake it up. This lets you quickly wake the computer back up to the same state it was in when it went to sleep-including any documents and folders you had open. When you put your PC to sleep, it enters a power-saving state where it shuts down power to most of the PC’s components, keeping just enough power trickling to keep the memory refreshed.