We also have a time difference of 8 hours (plus approx 18 hours travelling). In the past (before our Camino times), I used to feel shattered - couldn't get to sleep the first night, woke up at about midday the next day, etc.)
Now, we do it different! Bed by 10.00 p.m. - first night always in a pension and not in a dorm - alarm set for 7.00 a.m., up and out by 8.00 a.m. whereby we walk a full day, say until 2 or 3 p.m. and then we start our normal Pilgrim routine - checking in, shower, washing clothes, food, meet up with fellow Pilgrims and earlyish to bed by 9.30 p.m. I've done this now for the last 5 years and it works fine. Last year, after the 8.00p.m. Mass at Roncesvalles, we even walked down through the forest to Burgete (3 kms), where we had booked for the first night in a lovely Casa Rural. Anne