Routine when your routine is disrupted

Classical texts identify irregularity as a principal cause of vata disturbance, and list travel, irregular meals, disturbed sleep and excessive movement among the specific factors.

That framing has aged well, because the situations it describes have become considerably more common.

What disruption actually does

The circadian system regulates a great deal more than sleep — body temperature, hormone secretion, digestive function, immune activity and cognitive performance all follow daily rhythms.

Disruption has documented consequences. Shift work is associated in epidemiological studies with increased risk of metabolic disorders, cardiovascular disease and other outcomes, and it is recognised as an occupational health issue.

Jet lag produces measurable impairment in cognitive performance, digestive function and sleep, resolving over days as the circadian system re-entrains.

So the classical observation that irregularity is disturbing is not merely poetic.

Travel

Light is the main tool. Circadian entrainment is driven principally by light exposure, and deliberate management of it is the most effective intervention available.

Broadly: after eastward travel, seek morning light at the destination and avoid it in the evening. After westward travel, seek evening light. The relationship reverses for very large time shifts, and various tools exist to calculate the appropriate schedule.

Adopt local time immediately for meals and sleep, rather than transitioning gradually.

Meal timing has some influence on peripheral circadian clocks, and eating on local schedule is a reasonable adjunct.

Melatonin has evidence for reducing jet lag symptoms when taken at appropriate times, and timing matters more than dose. Discuss with a pharmacist or doctor, particularly regarding availability and regulation, which differ by country.

Caffeine, used deliberately to maintain alertness during the local day and avoided in the local evening.

Hydration and movement, which help with the general discomfort of travel without affecting circadian timing.

The classical measures for travel

The texts recommend warm, moist, nourishing food, oil application, adequate rest, warmth and regularity as the counter to the drying, mobile qualities attributed to travel.

Practically: eat warm cooked food rather than snacking on dry items, stay hydrated, moisturise, sleep as much as circumstances permit, and re-establish regular meal and sleep times as quickly as possible.

None of this is objectionable and most of it corresponds to sensible travel advice arrived at from other directions.

Shift work

Harder, because the disruption is chronic rather than transient.

Consistency within the pattern. A fixed shift is easier to adapt to than a rotating one. Where rotation is unavoidable, forward rotation — morning to evening to night — is generally better tolerated than backward.

Light management. Bright light during the working period, and darkness during the intended sleep period. Blackout blinds are essential for daytime sleep, and sunglasses on the journey home after a night shift reduce the light signal that promotes waking.

Anchor sleep, maintaining a consistent core sleep period across all schedules, provides some circadian stability.

Strategic napping, including before a night shift, has evidence for improving alertness.

Caffeine timing, used early in the shift and stopped several hours before intended sleep.

Meal timing. Eating large meals during the biological night is associated with poorer metabolic outcomes. A lighter approach overnight with the main meal during the biological day is a reasonable adjustment where the schedule permits.

Irregular hours generally

For anyone whose schedule varies without being formal shift work — caring responsibilities, irregular working, frequent travel — the same principles apply in a weaker form.

Fix what can be fixed. A consistent wake time is more achievable than a consistent bedtime and anchors the system. Consistent meal times, particularly the first meal of the day, provide a further signal.

Accept that adaptation is partial and adjust expectations of performance accordingly.

Reducing training and demands during disruption

A point the classical framework makes and contemporary advice tends not to.

Periods of disrupted routine are periods of reduced capacity. Attempting to maintain the same workload, exercise volume and demands produces accumulated depletion.

Reducing deliberately — lighter exercise, simpler food, fewer commitments — during and after disruption is sensible rather than weak.

When to seek help

Persistent difficulty sleeping despite good practices, excessive daytime sleepiness affecting safety, falling asleep while driving, or symptoms of depression during prolonged shift work all warrant medical assessment.

Shift work sleep disorder is a recognised condition with management options, and occupational health services exist for exactly this.

Excessive sleepiness affecting driving or safety at work requires prompt medical attention. Discuss melatonin or any sleep aid with a pharmacist or doctor.