Caffeine ceiling
Coffee is the default standup fuel—until afternoon shots steal sleep, raise next-day anxiety, and nudge blood pressure. Dose and timing matter more than moralizing.
How much is too much
Many adults tolerate ~400 mg caffeine daily (roughly four brewed cups—varies by roast and size). Sensitivity rises with age, anxiety disorders, and poor sleep. Energy drinks stack caffeine with sugar—double metabolic hit.
Cutoff experiments
Stop caffeine 8–10 hours before target sleep for a week; log sleep latency and morning BP if you track it. Switch afternoon meetings to decaf or herbal without announcing a “quit”—just test.
Hidden sources
- Pre-workout powders, migraine meds, some sodas and chocolate.
- “Half-caf” still counts if volume is high.
When caffeine masks problems
Exhaustion needing constant refills may signal sleep apnea, depression, thyroid issues, or burnout—fix root causes, do not only upgrade to a stronger roast.
Workplace wellness context only—not diagnosis. Seek urgent care for emergency symptoms.