Finding:

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   Caffeine

   In North America, 90% of adults consume some amount of caffeine daily. ... "Adenosine and sleep-wake regulation.".
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   Sleep

   The circadian clock, an inner time-keeping, temperature-fluctuating, enzyme-controlling device, works in tandem with adenosine, a neurotransmitter which inhibits many of the bodily processes that are associated with wakefulness. ... Caffeine
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   Neuropsychopharmacology

   Green light in the eye inhibits pineal production of melatonin (Inhibitory connections shown in red). ... Caffeine is known to block adenosine receptors, thereby inhibiting sleep among other things.
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   Sleep inertia

   Studies have shown that drugs such as caffeine suppress the effect of sleep inertia, possibly by blocking adenosine receptors in the brain.
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   Migraine

   | 2 | moderate pain | inhibits, but does not wholly prevent usual activities | ... Moderation in alcohol and caffeine intake, consistency in sleep habits, and regular meals may be helpful.
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   Nootropic

   Inhibits lipofuscin formation. ... Caffeine is the most widely used psychoactive substance in the world, and may be susceptible to strong levels of tolerance.
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   Modafinil

   However, it appears to be higher than oral LD50 of caffeine. ... ↑ Erman MK, Rosenberg R, For The U S Modafinil Shift Work Sleep Disorder Study Group.
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   Stimulant

   In large doses, caffeine is also a mild diuretic. ... They have minimal effect on sleep structure, and do not cause rebound hypersomnolence or "come down" effects.
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   Potential effects of tea on health

   Caffeine is an addictive substance and overuse of tea can result in harmful side effects, such as an increased likelihood of certain sleep disorders.
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    Adenosine

    The A2A and A2B receptors couple to Gάs and mediate the stimulation of adenylate cyclase, while the A1 and A3 adenosine receptors couple to Gάi which inhibits adenylate cyclase activity. ... By nature of caffeine's purine structure it binds to some of the same receptors as adenosine.

Explore the following pages on Powerset:

• Caffeine,
• Sleep,
• Neuropsychopharmacology,
• Sleep inertia,
• Migraine,
• Nootropic,
• Modafinil,
• Stimulant,
• Potential effects of tea on health,
• Adenosine