One of the restart popups came up while I was typing, and I happened to press the space bar as it appeared. I believe it chose "restart tomorrow" for me but it

One of the restart popups came up while I was typing, and I happened to press the space bar as it appeared. I believe it chose "restart tomorrow" for me but it disappeared I cant be sure. Sure enough, the next day the pc is restarted, despite me having hibernated it before I left. Hibernate isnt even safe! Event viewer seems to show it waking itself up from hibernate on its own, an hour after I left.