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When the error panic(cpu 1 caller 0xfffffff0256548a4): “Sleep/Wake hang detected” occurs on your MacBook, it means your Mac is experiencing a kernel panic related to sleep and wake functionality.

In more detail, the operating system encounters a serious issue when it attempts to either go into sleep mode or wake up from it. During this transition, the system hangs or freezes, making the macOS kernel trigger a panic for diagnostic purposes.

The reasons why you keep receiving the “Sleep/Wake hang detected” error when your Mac goes to sleep or wakes up from it are below:

Your Mac has hardware problems. Your Mac’s battery, logic board, keyboard, or other components have certain malfunctions.

macOS bugs.

Third-party kernel extensions that interfere with the proper sleep/wake behavior.

Connected external devices may interfere with the MacBook’s ability to transition between sleep and wake states.

Certain critical system data related to power management is corrupted.

Incorrect wake and sleep-related settings.

Know more: https://iboysoft.com/howto/mac-kernel-panic-while-in-sleep.html