Get plenty of rest before the flight: Flying to Japan can be a long and tiring journey. Make sure you get plenty of rest before the flight so that you are well-rested and ready for the journey.
2. Bring snacks and entertainment: Bring some snacks such as granola bars and nuts to keep you energized. Bring a book or magazine to keep you entertained, or download movies and shows to watch on your electronic devices.
3. Stay hydrated: Dehydration is a common side effect of long flights, so make sure to drink plenty of water throughout the journey.
4. Wear comfortable clothes: Wear comfortable clothes to make sure you are as comfortable as possible throughout the flight.
5. Move around the cabin: Get up and walk around the cabin every few hours to keep your muscles from getting stiff and sore.