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Adenosine, caffeine, and sleep-wake regulation: state of the science and perspectives

期刊

JOURNAL OF SLEEP RESEARCH
卷 31, 期 4, 页码 -

出版社

WILEY
DOI: 10.1111/jsr.13597

关键词

chronic caffeine; circadian; genetics; sleep deprivation; sleep homeostasis; sleep-wake disorder

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  1. Fonds

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This review examines the current state of research on the effects of adenosine and caffeine on sleep, focusing on their mechanisms of action and influence on sleep homeostasis and the circadian clock. The potential clinical applications of this knowledge are discussed, along with unanswered questions that require further investigation.
For hundreds of years, mankind has been influencing its sleep and waking state through the adenosinergic system. For similar to 100 years now, systematic research has been performed, first started by testing the effects of different dosages of caffeine on sleep and waking behaviour. About 70 years ago, adenosine itself entered the picture as a possible ligand of the receptors where caffeine hooks on as an antagonist to reduce sleepiness. Since the scientific demonstration that this is indeed the case, progress has been fast. Today, adenosine is widely accepted as an endogenous sleep-regulatory substance. In this review, we discuss the current state of the science in model organisms and humans on the working mechanisms of adenosine and caffeine on sleep. We critically investigate the evidence for a direct involvement in sleep homeostatic mechanisms and whether the effects of caffeine on sleep differ between acute intake and chronic consumption. In addition, we review the more recent evidence that adenosine levels may also influence the functioning of the circadian clock and address the question of whether sleep homeostasis and the circadian clock may interact through adenosinergic signalling. In the final section, we discuss the perspectives of possible clinical applications of the accumulated knowledge over the last century that may improve sleep-related disorders. We conclude our review by highlighting some open questions that need to be answered, to better understand how adenosine and caffeine exactly regulate and influence sleep.

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