Which risk fundamentally constrains the duration of mammalian hibernation cycles within small endotherms?

💡 Explanation

During hibernation, reduced metabolic rate allows for energy conservation; however, the accumulation of toxic metabolic byproducts, like urea, eventually triggers arousal to clear them because renal function is suppressed. Therefore, metabolic waste drives arousal duration, rather than just fat depletion, crystallization, or oxidative damage each of which are longer-term considerations.

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