Related Experiment Video
Updated: May 25, 2026

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World
Published on: April 7, 2020
The dark before the dawn
1Emeritus Consultant, Horton Hospital, Epsom, Surrey.
Abstract:
Allow me to congratulate whoever was responsible for devising the title of this meeting. The inspired inclusion of 'The Dawn' conjures up so many poetic images and metaphors. But the one which, to my mind, is the most appropriate in the context of what the meeting is all about, is that written by Thomas Fuller, a seventeenth-century cleric and man of letters and, incidentally, a graduate of this great university (Cambridge). In his 'PISGAN- sight of Palestine' he opined, 'It is always darkest just before the day dawneth'. These words have a particular relevance for me and for those embryo psychiatrists of my generation who, before the outbreak of the Second World War, groped their therapeutic way towards the light.
Related Concept Videos
Nightmares and Night Terrors
Nightmares often...
Sleep-Wake Cycles
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Dark Triad and Person Perception
Dreaming
Altered States of Awareness
The ingestion of substances like stimulants or hallucinogens leads to chemical alterations in the brain that...
Subconsciousness and No Awareness
An illustrative example of subconscious processing is its role in problem-solving. Often, individuals...
