A lovely concept. 

Cooing softly into the ear of a loved one. A good time is right before you both nod off for the night. Let your partner know how happy, contented and serene you are feeling. Often, and over and over, serene and happy.  Coo away, even once they have drifted off. Maybe it would be a good time to mention something you've been wanting. Wanting a lot.

Why?

Because scientists have recently determined that auditory cues prior to sleeping increase memory.

This particular study didn't exactly have the findings that I had hoped for. At least not at this point. 

You see, they are linking getting a good night's sleep to memory making and reinforcing. What's a good nights sleep? Particularly when you are lying there, wide awake, trying to recall where you left your keys. 

I imagine the moral of the story for those of us who are clear that we can't remember anything is to talk, aloud, clearly to ourselves, as we negotiate through our day. "I am now putting my keys on the desk." This would be followed by shaking your keys vigorously. "Tomorrow I need to go to the supermarket." Mooing, clucking and oinking might help prompt what was on your shopping list. The list that, no doubt, you will invariably leave at home.

So, take an Ambien, turn off the light, one last key rattling and oink and rest assured that you might, in the morning, find your keys, to drive your car to your local supermarket, and buy what you need.

And if the aforementioned cooing to your partner worked, find a gift when you return home.