For me it is not the direction of travel but the local time of day at departure and local time of arrival.
For example when returning from Europe to Oz earlier in the year we left Dublin in the morning, connected through AUH at 2300 ish and arrived in Oz at 1900 the next day. So no sleep on first leg as it was 'light' outside and this was naturally an awake time. Second flight was a night time departure and after having been up all day was inclined ot sleep. Problem is that the sleep was done through the Oz day so on arrival wide awake and refreshed - jet lag ensued for 3/4 days.
However, when leaving Europe at night and arriving in Oz in the morning, 2 overnight flights, admittedly a bit tired on arrival I have minimal jet lag.
Same thing happens from Oz to US. With a morning departure from Oz with a same day morning arrival on West Coast, not inclined to sleep on the flight, until the last couple of hours. Arrive with a whole day ahead and having had virtually no sleep. Jet lag ensues. Trip back to Oz is a late evening departure with an early morning arrival - a long night. No jet lag to speak of.
For example when returning from Europe to Oz earlier in the year we left Dublin in the morning, connected through AUH at 2300 ish and arrived in Oz at 1900 the next day. So no sleep on first leg as it was 'light' outside and this was naturally an awake time. Second flight was a night time departure and after having been up all day was inclined ot sleep. Problem is that the sleep was done through the Oz day so on arrival wide awake and refreshed - jet lag ensued for 3/4 days.
However, when leaving Europe at night and arriving in Oz in the morning, 2 overnight flights, admittedly a bit tired on arrival I have minimal jet lag.
Same thing happens from Oz to US. With a morning departure from Oz with a same day morning arrival on West Coast, not inclined to sleep on the flight, until the last couple of hours. Arrive with a whole day ahead and having had virtually no sleep. Jet lag ensues. Trip back to Oz is a late evening departure with an early morning arrival - a long night. No jet lag to speak of.
Rob