The Neurobiology of Fatigue: When Sleep Isn’t Restorative
In this video, Dr Sanil Rege, consultant psychiatrist, explores the Neurobiology of Fatigue and why feeling tired is not always a matter of inadequate sleep. He explains how disrupted sleep architecture—particularly in non-REM and REM stages—can leave the brain in a state of hyperarousal, preventing true restoration. Chronic low-grade inflammation, reduced dopamine transmission, and the brain’s protective mechanisms can all contribute to persistent fatigue, manifesting as both physical heaviness and cognitive fog.
Dr Rege unpacks how fatigue is often a protective signal, not a sign of weakness, and why it can be amplified in psychiatric conditions such as ADHD, PTSD, depression, and anxiety. He highlights the role of dysregulated arousal, the overlap with chronic pain syndromes, and the importance of recognising fatigue as a neurological and psychological phenomenon. This video equips clinicians and individuals with a deeper understanding of how to reframe, assess, and address fatigue in clinical practice and daily life.
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KEY TAKEAWAYS
- Fatigue can persist despite 8–9 hours of sleep when the brain remains hyperaroused, disrupting deep non-REM and REM stages.
- Chronic low-grade inflammation can reduce dopamine transmission, impairing motivation, clarity, and task-switching.
- Fatigue is both physical and cognitive (“brain fog”) and may present as feeling “wired but tired” or restless.
- Psychiatric conditions such as ADHD, PTSD, depression, and anxiety can amplify fatigue through dysregulated arousal.
- Fatigue is a protective neurological signal, not a weakness, and should be assessed within a brain–body survival framework.
To build on the neurobiological concepts discussed in this video, clinicians may find value in the Sleep and Psychiatry: Neuropsychiatric and Precision Approaches curriculum on The Academy, which offers practical tools to assess and manage sleep-related contributors to psychiatric presentations. Similarly, the Complex Mood Disorders: Diagnostic Precision and Advanced Management curriculum expands on how conditions such as melancholic depression interact with fatigue, integrating evidence-based strategies for diagnosis and treatment in complex mood presentations.
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