I downloaded moonlight on my phone and it has the option to turn your pc on and I used it quite. Now I don't use the app anymore but my computer started turning on by itself at a random day around 22:15.
Wait a minute...task scheduler is located in the operating system so it can't be possible that would be the cause for the computer randomly turning on. It would have to be in the bios right? I'd also check the bios to see if there's a scheduled turn on or something.