Jet lag happens when your internal body clock is not aligned with the local time after crossing time zones. It is mainly influenced by sleep patterns, light exposure, and daily routines.
Circadian rhythm is the system that needs to readjust for jet lag symptoms to improve.
1. Use light exposure properly (most effective method)
- Morning sunlight helps when adjusting to earlier time zones
- Evening light helps when adjusting to later time zones
- Get outside soon after waking up
- Limit screen light at night during adjustment
2. Start adjusting before travel
- Shift sleep time by 1–2 hours toward destination time a few days before flying
- This reduces the shock on arrival
3. Control naps
- Keep naps short (20–30 minutes)
- Avoid long naps that disrupt nighttime sleep
- If very tired, a short nap is better than oversleeping during the day
4. Melatonin (if used correctly)
- Small doses can help reset sleep timing
- Take before intended bedtime at destination
- Often more helpful for eastward travel
5. Follow local time immediately
- Sleep and wake according to destination time as soon as you arrive
- Staying consistent helps faster adjustment
6. Use caffeine carefully
- Can help maintain alertness during the day
- Avoid it late in the afternoon or evening
7. Stay hydrated and match meal times
- Drink enough water during travel
- Eat according to the new local schedule
Less effective methods
- Sleeping the whole flight does not fully prevent jet lag
- Alcohol worsens sleep quality and dehydration
- Unplanned sleep medications can interfere with adjustment
Recovery time
- About 1–3 days for short trips across a few time zones
- Roughly one day per time zone crossed for full adjustment in many cases
