Safety and Limitations

Use Extra Caution When

• ⚠ You feel unsafe to drive after a shift.
• ⚠ You have untreated insomnia, sleep apnea, narcolepsy, severe anxiety, depression, bipolar disorder, or another condition that affects sleep.
• ⚠ You are pregnant, breastfeeding, taking sedatives, taking stimulants, or using medication that interacts with caffeine or melatonin.
• ⚠ You operate heavy machinery, drive commercially, provide patient care, or make safety-critical decisions while fatigued.

Melatonin Boundary

CircaFlow uses conservative timing guidance and a low default dose. Melatonin can still be inappropriate for some people. Users should follow product labels, local rules, and clinician advice. The app suppresses melatonin guidance when pregnancy, postpartum status, or medication context is reported.

Caffeine Boundary

Caffeine recommendations are timing guidance, not a safety guarantee. Some users metabolize caffeine slowly, and caffeine can affect sleep even when stopped several hours before bed.

Confidence Labels

The app lowers confidence when schedule context is sparse, shifts rotate quickly, or when health or medication context increases risk. Low confidence means the plan is a conservative fallback — a starting point, not an exact instruction.

Wearable Data Boundary

Wearable sleep input is advisory. Health Connect syncs help estimate recovery debt, but they do not guarantee the underlying wearable was accurate and they do not replace symptom awareness.