When a girl responds to your texts late at night, does it have any significant meaning?

So i had sent her something earlier today, but since she had some activities during the day she couldnt respond (she already told me about her hard schedule). She did respond to my message like around 1.30 ll
should i take this a sign of interest?
and what should i respond;just goodnight?
Updates
+1 y
ow yeah i forgot to mention, she has shown huge interest in me already, especially the last few days
When a girl responds to your texts late at night, does it have any significant meaning?
Post Opinion