Caffeine is a part of many people's routines, whether it be a shot of coffee or a cup of tea. 

If you've ever noticed a headache creeping in when you've missed your morning cup of joe, Norman and Tegan are here to explain why. 

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References:

• Adenosine, caffeine, and sleep–wake regulation: state of the science and perspectives
• Caffeine for headaches: Helpful or harmful?
• Caffeine in the management of patients with headache