Hi Drew, 

I think we are more precise in French as to the time of the day -

L'autre soir = the other evening 

L'autre nuit = the other night 

For instance, you would use,  l'autre nuit if you were saying -

J'ai mal dormi l'autre nuit = I slept badly the other night 

But you would use 'soir' if you were referring to an evening out as in this example.

Patrice est venu nous voir l'autre soir = Patrice popped in to see us the other night (evening) 

Having said that,

we use 'Bonsoir!' for 'Goodnight!'

Hope this helps