Cultural jet lag is when you feel tired and confused because you are not used to the way things are done in a new place or culture. It's like when you go on a long trip, and the time difference makes you feel weird when you get there. For example, if you are used to going to bed at 8 pm and waking up at 6 am, but you go to a place where people stay up late and wake up late, it might be hard to adjust.
Imagine you are playing with your toys at home, and everything is how you like it. Then, you go over to a friend's house, and they have different toys and rules for playing. You might feel confused, and it might be hard to have fun at first because you are not used to it. That's what cultural jet lag feels like, but instead of toys and friends, it's about different cultures and customs.
It's important to remember that everyone has their own way of doing things, and it's okay for things to be different. Usually, after a little bit of time, you will get used to the new culture and start to enjoy it. So, if you ever feel tired or confused in a new place, remember to take it easy, be patient, and try to learn and enjoy the new things around you.