Reading Matthew Walker’s ‘Why we sleep’ was a key experience, opening up information about new understandings of sleep and its importance to health and development in human beings and other creatures. Why We Sleep - Wikipedia
Walker recommends 7-8 hours sleep every night to preserve good physical and mental health and to aid recovery in the face of illness or trauma.
His research and that of others have found that broken sleep predicts the emergence of Alzheimer’s disease. Good nights’ sleep is associated with preserved cognition: How we sleep today may forecast when Alzheimer’s disease begins | Berkeley News
Reports from recent research tell us now about the relationship between daytime naps and Alzheimer’s disease Long naps may be early sign of Alzheimer’s disease, study shows | Alzheimer's | The Guardian