While Charles de Gaulle airport is not the most suitable for overnight stays, at least those passengers who have a connecting or early flight in the morning, will be able to stay at night without any problems. The terminals remain open 24 hours, with the T2 E being the most comfortable and without homeless people sleeping there.
In Terminal 2E, opposite gate L, there are orange armchairs where you can sleep. Terminal 2A is another of the most chosen by those who want to spend the night. It is always advisable to have an eye mask on hand. If you have to sleep on the floor, have a blanket as well since it is usually cold.
For those passengers who are stuck at the airport for a cancel or delayed flight for many hours becasuse of the weather or some other phenomenon such as a strike, etc., the airport has mattresses for these passengers. You must ask to an airport employee.
For those who can afford a hotel, there are alternatives within the airport complex.
Another option (paying or using a membership card) is to use one of the Vip lounges where you can access to more amenities and privacy, restrooms with showers etc. The only problem is they usually close by 11pm. At 6 am.
Baggage: left-luggage service closes from 9.30 pm to 6.00 am if the flight departs very early in the morning, you must stay overnight with your luggage, which makes it very uncomfortable, but there are no alternatives.
For eating and drinking: there are no bars, no fast food restaurants or traditional cuisine open 24 hours. Therefore passengers only have the vending machines. If your flight takes off at 6 in the morning, it is advisable to bring some food to the airport. Those with connecting flights will only have the vending machines.
Bathrooms: there are showers but only in VIp lounges or hotels within the airport grounds.
WI-FI: free internet access in Terminal 2F. For more speed, there are hourly plans with charge. There are also AC power plugs and sockets and usb ports to recharge the mobile devices.