![]() This cognitive state of reduced alertness is referred to as "sleep inertia". It's a growing concern as it can have serious consequences while performing high-risk tasks, including driving. ![]() Transitioning from sleep to alertness does not follow an on/off switch-like system, as brain imaging techniques have revealed. Waking relies on complex biological processes, including increased blood flow allocation to the brain. Studies show the brain regions important for alert performance (the prefrontal cortical regions) take longer to "start-up" than other areas (such as the basal ganglia) which are important for arousal. This means you can be awake, but not quite with it. Research has also shown blood flow activity within the brain to be diminished after waking, in comparison to the pre-sleep state.
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