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Have you try the following steps?
Access control panel > system and security > power options > balance recommended >click change plan settings. Once you are on the edit plan settings window, set the option that it says “Put the computer to sleep” to the time you would like to go to sleep, 1 minute, 10 minutes etc.
In the “change advance power setting” link, you could set the “hard disk” to turn off to the time you would like to, you can do the same with the “sleep after” option, “allow hybrid sleep” and “hibernate after”
Please let me know if you already try these steps above.
Thanks and regards!
In this case, try the steps provided at the following link:
NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.
If that does not work then it is possible that one application in your system is not letting the PC to go into sleep mode.
I have seen some customers having this issue caused by the network adapter, please follow the steps here:
Go to device manager, then network adapters and click on properties. Then click on the power management tab and uncheck "allow this device to wake the computer".
Please let me know.