Flight attendant issues warning to any passengers who fall asleep during ‘most crucial part of the flight’

It's officially June, which means that holiday season has well and truly arrived.

Whether you've had some annual leave booked in from the first week of January, or are looking to get a last minute holiday booked soon, it's time to get your sunnies on, pack your bags and head for the beach.

And another thing to remember when you get to the airport: there's a crucial time when you shouldn't fall asleep on your flight - and the reason why might surprise you.

You'll probably find yourself dozing off in the air. (Getty Stock Photo)

Ale, better known as Wonderfully Ale on YouTube has been a flight attendant for a decade, and revealed a few huge no-nos for people on planes.

Do not consumer your own alcohol

You might assume planes don't allow to drink your own booze so they can sell you their own drinks at an inflated price - but did you know it's actually against federal law to drink your own alcohol on a flight?

Explaining the reason why, Ale said: "We do need to make sure you're drinking responsibly and if you're drinking your own alcohol, we can't really track that."

Don't walk around barefoot

This one is kind of obvious, and as you'd expect, the reason why is pretty gross.

Ale said: "If you decide to take your shoes off in your seat that's a different story, but do not walk into the lavatory with bare feet.

"You never know what you're stepping on and the floor is not always the cleanest."

A flight attendant says that passengers can make the mistake during a crucial part of the flight. (Getty Stock Photo)

There's a crucial time you shouldn't fall asleep

It turns out that you should avoid falling asleep at one key time. Ale explained: "Let's talk about things you shouldn't do on an airplane coming from a flight attendant. The first tip is to try not to fall asleep before take off.

"I know travelling can be exhausting and sometimes you just wanna get on an airplane and go straight to sleep."

It is crucial not to fall asleep before take-off. (Getty Stock Photo)

"Not only is not good for your ears to fall asleep before take off, but you also want to remember that taxiing is one of the most crucial phases of flight so you want to make sure that you're completely awake in case of an emergency and in case you have to evacuate."

Users seemingly agreed with her in the comments section of the video.

One posted: "I usually can not sleep on a plane especially on takeoff and landing. Nevertheless on my last trip after 24 hours of travelling both ways I was asleep until right before we touched.

"This time I woke up from extreme ear pain. On the way back I woke up from the ding to undo your seatbelt."

Another commented: "Beyond the reasons you said, it also sucks to fall asleep before takeoff because then you'll likely be woken up four times by the announcements and seatbelt on/off noises and such.

"Better sleep (and safer, as she said) if you can wait."

A third put: "Most airplane emergencies happen at take off and landing, so it's crucial to be awake and alert at those times."