The word could indicates possibility, and the phrase to be able to do something means to have the power and skill to do something.
To me this sounds as if this person would only be able to lie down and close her eyes if she listened to your recording, your recording would give this person the power to do it.
At first, I thought of writing a note. But then I figured that with a
recording, you would be able to lie down and close your eyes.
Now, this sounds a little different it sounds that with a recorded message this person would have the option, the possibility to lie down, relax, close their eyes and listen to your recording.
At first, I thought of writing a note. But then I figured that with a
recording, you could lie down and close your eyes.