But remember: Cutting back on caffeine can be tricky, because if you decrease your intake abruptly or quit cold turkey, you can end up with killer headaches, serious fatigue, irritability, and other mood changes. (sleep.org)
Your missed opportunities from not thinking clearly or effectively at work... midday stiff - neck pains, killer headaches, (and the hidden eye rolls of your co-workers...) (sittingsolution.com)