It's past midnight & I'm wide awake, not even showing signs of needing my bed. I feel a bit shaky. Not visibly shaking but sort of a shaking sensation on the inside (not sure if that makes sense). I'm feeling anxious, a million and one worries, fears etc running through my head. I've no idea why I'm feeling like this. The only thing different about my day has been that I don't normally drink caffeine but today I've had 2 glasses of diet fizzy juice. Seems weird for that to be the cause but I just have no other explanation for how I'm feeling. Could this really be the effects of the caffeine?