Night Shift Caffeine Calculator
Night work runs your caffeine and your sleep in the wrong order. This plans both: when to dose during the shift, and the hard stop that protects the day-sleep after it.
Last drink starts before
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How it's computed
Same elimination model as the cutoff calculator (T½ 5 h base), but with a stricter bedtime limit: day sleep after a night shift is shorter and lighter, so we default to a 25 mg residual target instead of 50. Dose suggestions land caffeine at the circadian low point (~03:00–05:00) without poisoning the recovery sleep.