Sleeping overnight at the airport is no longer unfamiliar to travelers in general and backpackers in particular. There are many reasons to decide to sleep overnight at the airport, but whatever the reason, when you intend to do so, you need to prepare yourself.

Prepare a Backup Plan
Not all airports allow passengers to stay overnight, so you need to have a backup plan in case you get... kicked out. It could be a list of nearby hotels, a 24-hour café in the airport or nearby. This is absolutely necessary.
Bring Essential Items
Don't bring too much stuff, but don't bring nothing if you have a plan to sleep overnight at the airport. It could be a jacket, a thin blanket, a sleep mask,... Remember to keep it as compact as possible. In case you're traveling with a group or if you tend to get hungry, it's a good idea to buy some food beforehand.
Choose a Safe and Not Too Desolate Sleeping Spot
Sleeping in crowded places can be noisy, making it difficult to rest, while sleeping in deserted areas might not be safe. Therefore, it's advisable to select a spot that ensures safety while minimizing noise. Spots with surveillance cameras in the airport are recommended.
Protect Your Belongings
One common concern when sleeping overnight at the airport is the risk of belongings being stolen. It's essential to keep your belongings safe (along with yourself). Although there's no universal solution for this, based on experience, it's recommended to place your backpack in a spot that's hard for others to access. For instance, using a small backpack as a pillow, placing it to support your feet, covering it with a jacket, and then resting your head or feet on it,...
Is it Safe to Sleep Alone at the Airport
Whether it's safe to sleep alone at the airport depends on your preparation and the specific airport you're in. Sleeping with a group of acquaintances is generally safer and more enjoyable than sleeping alone.

Top Airports for Overnight Stays
Singapore Changi International Airport, Singapore (SIN)
Seoul Incheon International Airport, South Korea (ICN)
Helsinki International Airport, Finland (HEL)
Munich International Airport, Germany (MUC)
Vancouver International Airport, Canada (YVR)
Worst Airports for Overnight Stays
Islamabad Benazir Bhutto International Airport, Pakistan (ISB)
Jeddah King Abdulaziz International Airport, Saudi Arabia (JED)
Kathmandu Tribhuvan International Airport, Nepal (KTM)
Manila Ninoy Aquino International Airport, Philippines (MNL)
Tashkent International Airport, Uzbekistan (TAS)
According to TravelWithBui.org
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Reference: Travel Guide by Mytour
MytourJune 4, 2015