Oh, I love this breakdown. The 7 of Hearts is one of those cards people misunderstand a lot, and you nailed the nuance. And if any Cartomancy reading needs nuance, it’s one with the 7 of hearts.
Also, (depending on the type of spread you’re doing) if it lands between two cards of the same value, it traditionally signifies a gift, which is interesting. And between two Kings or Jacks, it means support from friends coming your way. I find these positional readings give the card more teeth when querents want something specific.
The ‘sweet dreams’ vibe you describe is spot on though. It’s always asking whether those dreams are serving you or keeping you stuck.