Timezone arithmetic 4

Most parts of Brazil are on UTC-3 and there is certainly no DST this close to the equator. So the time difference between Lisboa and Fortaleza is 4 hours since Portugal is currently on DST. The direction is such that I would be getting sleepy earlier and waking up before dawn. This is certainly the case, and that long ordeal with TAP has actually helped nudge the body clock later. 4 hours is not too bad and I expect my waking time will be normal in a few days.