Windows Task automatically wakes my computer, but doesn't put it back to sleep after

Question

My computer wakes itself up every day (presumably to do updates) which is fine by me, but it heats up my room by a considerable amount, and I rather not shut down, especially because it will automatically update in sleep mode. My only issue is that it doesn't put itself back to sleep once it is done doing whatever it is doing. Is there a way to force it to go back to sleep once it is done?

output of powercfg -lastwake:

Wake History Count - 1
Wake History [0]
Wake Source Count - 1
Wake Source [0]
Type: Wake Timer
Owner: [SERVICE] \Device\HarddiskVolume2\Windows\System32\svchost.exe (SystemEventsBroker)
Owner Supplied Reason: Windows will execute 'NT TASK\Microsoft\Windows\UpdateOrchestrator\Universal Orchestrator Start' scheduled task that requested waking the computer.

Answer 1

Windows 10 is by default configured to timeout and return to sleep two minutes after a system unattended wake up.

To verify these settings, start regedit and navigate to the key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0\DefaultPowerSchemeValues.

You will see here three entries:

381b4222-f694-41f0-9685-ff5bb260df2e    Balanced
8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c    High performance
a1841308-3541-4fab-bc81-f71556f20b4a    Power saver

Click on the entry corresponding to your power plan and verify the settings for the items ACSettingIndex for when plugged in and DCSettingIndex for when on battery.

Both items should have by default the value of "0x00000078 (120)". If they don't show this value, then set them as above.

For more information and methods, see the articles:

• How to Change System Unattended Sleep Timeout in Windows 10
• Windows 7: Sleep Return Timeout for Unattended Wake Up

Answer 2

I solved this by selecting the "Balanced" power plan in Control Panel > All Control Panel Items > Power Options. My theory, after reading harrymc's reply, is that the custom power plan I had created, didn't have an entry in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0\DefaultPowerSchemeValues. If that doesn't work, try clicking "change plan settings" and "restore default settings for this plan". Then of course make sure this plan is selected.