last tip: from Paris there are several regional night trains to Southern and Western France (see map below).
They all depart from Gare d'Austerlitz which is quite far (6 km) from Gare du Nord, where Eurostar arrives, but you could reach it by bike (Paris has many bike lanes) and it's definitely cheaper than TGV.
Here you can find more information about regional night train connections (only in French, sorry!)
voyagerentrain.fr/trains-nuit-…
#Train #NightTrain #Bike
Quelles sont les lignes de train de nuit en France ? - Voyager en train
Destinations desservies, prix des billets, services à bord, avantages... : tout savoir sur les trains de nuit de la SNCF.Voyager en train