Jet lag is one of the most annoying things. You go on a long-haul vacation and spend the first three days falling asleep all the time – but it doesn’t have to be that way. A sleep doctor has shared her top three tips to beat that horrible daytime fatigue when you change time zone, and they are all simple things that don’t cost a penny. Sleep expert’s 3 tips to beat jet lagSpeaking on Steven Bartlett’s Diary Of A CEO podcast, sleep expert Dr. Cheri Mah said there are things you need to do pre-flight, in-flight and post-flight to avoid jet lag. Jet lag is when your normal sleep pattern is distur…