https://www.itprotoday.com/mobile-management-and-security/disabling-windows-connected-standby

If a device supports Connected Standby, you should take advantage of that capability. Only modern applications that are registered can send a limited amount of network traffic at a scheduled interval, which means Connected Standby generally offers only benefits. However, if you want to use basic sleep instead of Connected Standby, you can disable the feature as follows:

    Start the registry editor (regedit.exe).
    Move to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power.
    Double-click CsEnabled and set to 0, then click OK.

Also check that your hard disk is not turned of:

Disable windows sleep

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