Should I send my boyfriend a long message when he’s asleep?

I’ve done this thing where when my boyfriend is asleep, because I’m a night owl, I will send him a nice message before I go to bed late so that he will see it when he gets up early. I like it because it make him really happy. Only this time I’m afraid it’s too long and I’m scared that since he has a Samsung, it’ll split into multiple messages and blow up his phone that I’m not sure he remembered to turn night mode on.
Should I send my boyfriend a long message when he’s asleep?
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