Traveling by air can be pretty exhausting, so no wonder a lot of people choose to sleep through it. And while doing so is simply inevitable if you have a long-haul flight, you can actually put your health at risk if you doze off during take-off or landing.  There are also a lot of other things can make your trip on a plane less safe and less comfortable. For example, taking your shoes off, not asking a flight attendant before switching seats, using the blankets, and even wearing your contact lenses! 

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