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night shift circadian optimization

v1

Evidence-based protocol for managing meal timing, exercise, and light exposure for night shift workers.

Available
shift-workchrononutritioncircadian-rhythmsleep-hygiene

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FitnessGrid is an AI coach that plans your week and adapts as you go. Install night shift circadian optimization and your coach will follow this protocol every week, learn from what you actually do, and adjust on the fly.

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Procedure

  1. Assess and Adapt Schedule

    • Identify the user's shift start/end times and sleep windows.
    • Use update_preferences to set preferred workout and meal windows that align with the night shift schedule.
    • Recommend a "clockwise" rotation (Day -> Evening -> Night) if the user has influence over their scheduling.

  2. Optimize Chrononutrition

    • Meal Placement: Use create_meal to schedule the largest, most calorie-dense meals before the shift (dinner) and after waking up (lunch).
    • Nightshift Intake: Between 12:00 AM and 6:00 AM, pivot to small, high-protein, high-fiber snacks (e.g., Greek yogurt, nuts, hard-boiled eggs).
    • Metabolic Safety: Instruct the user to avoid high-carbohydrate or heavy, high-fat meals during the biological night (12 AM – 6 AM) due to impaired insulin sensitivity.

  3. Caffeine and Stimulant Protocol

    • Schedule caffeine doses (approx. 200 mg) using create_note or meal logs for 30–60 minutes prior to the shift start.
    • Set a hard caffeine cutoff 4–6 hours before the target sleep time to protect sleep architecture.

  4. Exercise Programming for Phase Delay

    • Use create_workout to schedule 2–3 sessions of moderate-intensity aerobic exercise (30–60 minutes) per week.
    • Timing: Sequence workouts to act as a "phase delay" (late afternoon/early evening before the shift) to help the body adapt to the night schedule.
    • Safety: Ensure high-intensity sessions are not scheduled immediately before the daytime sleep window to prevent elevated core temperature from disrupting sleep onset.

  5. Sleep and Light Hygiene Instruction

    • Create a create_note with the following environmental protocols:
      • Bright Light: Seek intense light exposure during the first half of the night shift.
      • Commute: Use dark goggles or wrap-around sunglasses during the morning commute home to prevent light-induced phase resetting.
      • Environment: Use blackout curtains and eye masks for a completely dark daytime sleep environment.
      • Strategic Napping: Recommend a <30 minute "operational nap" between 2:00 AM and 5:00 AM if safety/work policy allows.

  6. Monitor and Adjust

    • Use render_suggestion_chips to prompt the user to log energy levels or sleep quality daily.
    • Adjust meal timing or workout intensity if the user reports significant "social jetlag" or digestive distress.