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Most airlines have low-cost flights departing before 6am or after 10pm every day. This will make passengers tired because they have to stay up late and wake up early to check in and wait to board the plane. Therefore, drowsiness will follow you until you sit on the plane seat. However, this is not good for your health. When the plane takes off or lands, passengers should stay awake to clear the Eustachian tube by jaw movements such as chewing gum, yawning or swallowing saliva, drinking water...
Therefore, if you sleep and do not do those things, it will easily cause tinnitus, headaches, and even for people with poor Eustachian tube function, it can cause damage to the eardrum, nosebleeds or affect hearing for up to a week after the flight ends.
Therefore, to help the trip go smoothly, you should only sleep when the pilot announces that the plane has reached a certain altitude, which is also the time when the seat belt sign turns off. However, don't forget to wake up before the plane descends and lands! When the flight attendant tells you to put your seat back upright, it's best not to sleep, but instead chat with your fellow passengers.
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