It's hard for me to understand why many laptops these days are designed to be awakened from sleep mode by any key on the keyboard. In the olden days, it wasn't exactly taxing to have to reach for the power button to wake up a laptop. By allowing the entire keyboard to trigger a wake-up, I get plenty of unwanted wake-ups.
To prevent this, I tried the following using my Administrator account.
(1) I tried the first 4-step process at https://answers.microsoft.com/en-us/windows/forum/all/prevent-keyboard-from-waking-laptop/6fd4e751-f2c0-418b-82d9-f340bae14375. In the Device Manager, my keyboard is "Standard PS/2 Keyboard". When right-click the keyboard, however, I do not have have a Power Management option. Hence, I can't complete the process.
(2) I tried the process at https://www.top-password.com/blog/stop-mouse-keyboard-from-waking-computer-in-windows-10. In the Keyboard Properties window, under the General tab, there is supposed to be a "Change settings" button, but I don't have one. Without it, I cannot reveal the "Power Management" tab.
(3) The following site has a procedure similar to (2), but again, I have no Power Management tab, so I can't use the process: https://www.online-tech-tips.com/computer-tips/stop-mouse-from-waking-windows-up-from-sleep-mode
(4) Page Is there anyway to stop a Windows 10 laptop from waking up because of accidental keyboard interaction in a bag? mentions "wake on keyboard" but I don't have such a control
Option (1) also a 3-step process using "powercfg", while option (2) also has a process involving the BIOS. Before I attempted either one of those, I wanted to check and ensure that I don't do something terrible to my laptop. Specifically, I don't have a traditional power button. The power button looks and feels like just another key on the keyboard. If I succeed in disabling keyboard wake-up using "powercfg" or the BIOS, will my laptop remain asleep forever?
POSSIBLY RELEVANT DETAILS
My laptop is a Acer TravelMate P2 P2410-G2-M NX.VGTAA.006
Following https://www.howtogeek.com/122954/how-to-prevent-your-computer-from-waking-up-accidentally, I got no information about the cause of the wake-up when it is done using the keyboard:
$powercfg -lastwake Wake History Count - 1 Wake History  Wake Source Count - 0
Also following the above link, the event viewer showed the cause of the wake-up was "unknown". I didn't follow the rest of the webpage because it proceeds to prevent input devices from waking the computer. My concern is that the button appears to be a key on the keyboard, so if I disable the keyboard's ability to wake the computer, I'll never be able to wake the computer. My only hope is if the power button isn't really considered a keyboard key, despite the fact that it looks and feels exactly like one.