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This is not specific to Linux. Windows also constantly wakes up whenever it don't want it to. A lot more often than 20%.

It's incredibly annoying. Sometimes I put a PC to sleep, and it will wake up a minute later. Sometimes it wakes up in the middle of the night to spin up its fans. Laptops I put to sleep without being hooked up to power will have their battery drained next time I want to use them. I can't imagine any OS being worse at sleeping than Windows.

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Check your USB devices - they can wake up your PC. You can disable this on a per-device level in the device manager. Find the device, open it's properties and find the setting under the "Power management" tab. A windows PC can also be woken up by "Wake-on-LAN" magic packets sent to your network card. Go to your network adapters and open it's properties. Press the 'Configure' button. Go to the Advanced tab and find "Wake on Magic Packet" and turn it off.

I found it to be my USB mouse. I'd already disabled the option to wake the PC in the mouse device, but then found out that you also have to do that with a separate "keyboard" device[1]. But ever since disabling the option on both devices, things have become a lot better.

[1] https://answers.microsoft.com/en-us/windows/forum/windows_10...

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