A sweet, good night text message for a romantic partner typically focuses on examples of the love the texting partner has for the other. These may include practical examples as well as symbolic or metaphorical examples of love.
Basic examples of a sweet text include one partner telling the other he could not sleep until he texted her. More emotional examples include a partner texting that he loves the other more every day. Another emotional example is telling the other that he feels incomplete without her and that he never wants to experience being without her again. Common metaphors for emotional text messages include calling partners nicknames such as "prince" or "princess."