I write this while sipping an oat latte, feeling the graceful flush of caffeine surge through my body. My senses are livened, my thoughts crystallised, and my fingers dance happily across the keyboard.

Put simply, when caffeine enters our system it electrifies the mind by blocking sleep hormones from reaching our receptors. These sleep hormones continue to be produced, building up in the brain – something sleep scientists refer to as ‘sleep pressure’. When the dam of caffeine wears off, these hormones flood the system, leading to the inevitable ‘caffeine crash’.

Plants are “biochemical ...


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