Personally, the time difference doesn't cause my Jet Lag, because no matter what I had been up for the same amount of time. Where I have heard you get Jet Lag is more from the constant droning of the Plane's engines/jets. That the sound in your ear is what tires you out. Since I have been using Noise Isolation or Noise Cancellation headphones, I don't get Jet Lag anymore.
Originally posted by trupti nigam: Even when the time difference is 3 hrs like US east coast and west coast, you get jet lag.
I think it depends on the person. I don't get jet lag for the three hours between US east and west coast. It also depends on the direction you are traveling.
Also, most people are used to some natural variation. (For example, do you wake up the same time during the week and one weekends.) This helps reduce it a bit - which is why nobody complains about jet lag for a one hour time differences.
Important to distinguish between jetlag and travel tiredness.
I find that travelling between Australia and the UK, the 24 hour journey arriving in London early morning is of course very tiring, that whole day I'll be drifting off to sleep, but provided I can keep myself on the go until about 7pm I have no jetlag issues (i.e. I get a long sleep at night and despite feeling fatigued manage to stay awake during the day).
Returning home to Australia, however I'm for some reason less fatigued on the day of arrival (again usualy early morning arrivals) - but despite being more spritely suffer from jetlag for a number of days (fall completely asleep solidly at 4pm and wake up in at a stupidly middle of the night time.
Also worth noting as I've got older the adjustment definately takes longer! - As a 16yr old I didnt notice any jetlag (or much fatigue) AT ALL!
My daughter was 1yr old last time we did the trip and she suffered no ill-effects at all, settled into a new routine instantly (much to the relief of all around).
Flying from Brisbane to India you are likely to suffer a bit of fatigue 'cos presumably you have to go via Singapore or Sydney (or both) and every transfer takes a bit more energy out of you!