Sleep inertia can temporarily impair alertness and performance after waking.

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The classification describes the evidence supporting this claim, not the Human OS framework as a whole.

Hilditch and McHill review sleep inertia as a temporary period of impaired performance and reduced alertness following awakening.

This does not establish that alarms are inherently harmful, that one wake time is optimal for everyone, or that every difficult morning reflects circadian misalignment.

This is the narrower evidence-supported component of the Chapter 3 morning example. The manuscript's broader interpretation of one expensive schedule remains authorial.

Supported by appropriate human studies, major reviews, trials, cohort research, or converging evidence. The strength of the category does not remove population, dose, timing, or context limitations.

Sources are listed according to the role they play in this claim. One source may provide direct support, another may explain a mechanism, establish a limitation, or prevent an interpretation from becoming broader than the evidence allows.

The printed book preserves the claim inside the argument that gives it meaning. These references connect the current digital record to the first-edition evidence trail.

This claim connects to the following parts of the Human OS architecture. The module labels locate the claim inside the framework; they do not imply that the research source validates the architecture itself.