PikaOS maybe too “hobby oriented” to expect “sleep stability”, but I understand most/all bugs to be debian or kde upstream ones. Is gnome still much better at stability? Is there a distribution that fixed sleep problems for you? open vs closed nvidia drivers?
Are there motherboard manufacturers that suck less at linux?
Waking up from sleep is of course part graphics card/drivers, and BIOS code. My husband had his share with his nvidia card crashing the system when coming up from sleep under Wayland, but I believe these things have been mostly ironed now. However, if you have a buggy BIOS, you’re out of luck. I’ve had such a DELL laptop, latest firmware installed, and no matter which distro I tried, it wouldn’t wake up from sleep properly. So, if that’s your issue, there’s not much you can do, apart from getting compatible hardware. There are hardware lists of compatible hardware in some places, including archlinux’s wiki i believe.