Method 1: Open the operation and enter powercfg -h on in the window. Method 2: Open a command prompt as an administrator and enter powercfg.exe/hibernate on. At this time, you can open the start menu in the lower right corner to see if hibernation has come back. If it still doesn't come back, open the Control Panel-Power Options, and then click Change Plan Settings: Then open Change Advanced Power Settings: Then select Sleep-Allow Mixed Sleep, and check whether the power and battery are turned off. If yes, please select Close. Take another look. This sleep button should come out.