System Not waking Up
Make sure that all your device drivers are up-to-date. If not, then update your drivers.

2] Use Windows Power Troubleshooter and see if it is able to diagnose and fix your problem automatically.

2] Start Windows in Clean Boot State and see if problem disappears. If so then some program or process is interfering with resumption from Sleep. Try to identify the process.

3] For your Keyboard and Mouse, ensure that the Allow this device to wake the computer setting is checked.

You will see this setting in the devices Properties box, under Power Management tab.

4] Open an elevated command prompt window, type the following command and hit Enter:

powercfg –devicequery wake_armed
This will list devices that are currently configured to wake the computer from any sleep state.

Next run:

powercfg –lastwake
This will give you information about the event that woke the computer from the last sleep transition.
5] If Hybrid Sleep is enabled, it is known to cause such problems.

computer will not sleep

In the Put the computer to sleep box, select a new value such as 15 minutes. However, make sure that you do not select Never. Then, click Change advanced power settings. Expand Sleep, expand Allow waker timers, and then select Disable.