Jet lag

Adapting to jet lag is never an easy thing to some people,

especially when you just returned to your home country after you have adapted to the travelled country in which the timezone difference between those 2 is large.

if it happens that you are going to a short trip that involves long-distance flights, 

feel free to go through my lesson learnt from my experience: 

6 hours difference: sleep tight on your plane

12-15 hours difference: DO NOT sleep on your plane.

This makes your life better when you're back,

otherwise,

sleeping at 9pm and insomnia continues at midnight.