When booting the Linux kernel using UEFI SecureBoot, the kernel is put in the lockdown mode to restrict the ability to modify the running kernel image or leaking data from kernel memory. Kernel lockdown mode can also be manually enabled by the user/administrator. Among the limitations imposed in Linux's lockdown mode is no hibernation support. But that soon may be relieved with new patches proposed.
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Yah, that hibernation/sleep function is a fubar in Debian, Zorn and Mint. The computer practically locks up and becomes non-responsive. I literally have to override it and tell the OS to ignore sleep and hibernation mode in configuration to avoid the problem. Otherwise, I end up having to reboot after a long lock period (like overnight).