Overnight at the airport
For passengers with a delayed or rescheduled flight, connecting or initial departure, in late night hours or early in the morning, the airport terminals are open 24 hours a day. However, some zones at the boarding area close at night. Therefore, if the desire is to spend the night at the Airside, be aware of leaving or entering the boarding area before closing (if it coincides with those areas after security that close)
Where to rest: According to the comments of the users, there are no comfortable chairs to sleep since they all have armrests. Therefore, the most appropriate option is to rest on the floor. It is suggested to have on hand an eye mask and ear plugs as the airport has a lot of people at night and is usually a bit noisy as well. If you have to sleep on the floor, have a blanket on hand since it is usually cold. The carpeted floor of the North Terminal seems to be the more comfortable.
In case of passengers delayed at the airport by a canceled or delayed flight , airport personnel may provide blankets or mattresses.
Another option (by paying or using a credit card that provides the service) is to use some of the VIP lounges where you can access to more amenities and privacy, more comfortable bathrooms etc. Avianca VIP lounge is open 24 hours. But most rooms begin to open from 4 am until 9 or 10 pm.
If you want to sleep without interruption, there are several hotels nearby and the Miami International Hotel is located in the Central Terminal, Concourse E, with options for half-day rooms.
Baggage: At Concourse E, Level 2 there is a luggage storage service available from 5 am to 9 pm, so if you have not checked in yet, you will have to spend the night with your bags on your back
Eating and drinking: some fast food stands are open 24 hours. At concourse D door D26 (boarding area), Concourse E and F, in public area, second level.
Bathrooms: there are showers in both the Admiral's Club Lounge and Club America lounges
WI-FI: Miami airport has free internet access for the first 30 minutes and also several connecting points in different areas of the terminals. There are AC power plugs and sockets and usb ports for recharging mobile devices.
The Miami International Airport Hotel (Tel +1 305 871 4100) is found on the second level of the Central Terminal. There are many other accommodations nearby and in the city centre with transfer services for their guests. Sheraton Miami Airport Hotel & Executive Meeting Center (Tel +1 305 871 3800), Holiday Inn Express & Suites Miami Arpt and Intermodal Area (Tel +1 786 878 5555), Red Roof PLUS+ Miami Airport (Tel +1 305 871 4221), Embassy Suites by Hilton Miami International Airport (Tel +1 305 634 5000), Element Miami International Airport (Tel +1 305 636 1600), MIA Airport Villas (Tel +1 305 794 6991), Courtyard Miami Airport (Tel +1 305 642 8200), Residence Inn Miami Airport (Tel +1 305 642 8570), Miami Airport Marriott (Tel +1 305 649 5000), Miami Airport Hotel (Tel +1 786-814-8427).