Dear Remind 101,
If it is early enough that I am still grading their homework, then, no, it is not “a little late” for me to be sending a reminder text message.
Especially not if the message is, “I am grading your homework RIGHT NOW. Quick! Turn it in and act like it’s been there THE WHOLE TIME.”
I mean, I will be well and truly apologetic if I have interrupted some student’s sleep or even other homework. But less so when I have interrupted the next level of Minecraft and/or Angry Birds.