Three to four weeks? Over a one hour change?
Boy, I hope you don't travel much. Jet lag must throw you off for a year.
Yes, I have often traveled from the Eastern Time Zone to California and after 3 days I get used to the change. My body sees that the Sun, in the sky changed, and my body should change too. But, when we change the clock without changing the time that is when I get screwed up. There are some people like me who set their body clocks on the sun and some that don’t.