Even relatively small amounts of light can reset the body's internal clock, so find as dark an environment as possible when traveling.

CNN: Sleep tips for the road-weary

If the climate or hour of the day at the new destination don't allow for lots of light, a small, portable light box, some of which double as an alarm clock, can be purchased.

WSJ: To Avoid Jet Lag This Summer, Travel Like a Scientist

Evidence of past explosions is revealed in the image - huge lobes of 20-million-degree Celsius gas (the red loops in the image at approximately the 2 o'clock and 7 o'clock positions) that extend over dozens of light-years on either side of the black hole.

BBC: Black hole 'on a diet'