Quality, composition...all of it is very well done. I honestly can't think of much critique. Your strings are perfect for this piece, and complement the piano wonderfully. Very beautiful melodies, and equally so with your playing. Soft, nice, and yes. I think I will try listening to this before I fall asleep tonight. :)
The only thing that prevents an easy drifting away into restful sleep is the very last note by the strings that suddenly rises in volume. It's only slightly startling, because it brings you right back into the piece and away from the clouds, grounding you back to Earth.
The ending piano notes would have sufficed just as well. However, this is just a very tiny complaint, and solely for the purpose of which this piece was made for; I will probably fall asleep long before it ends :)
Again, very beautiful piece! Instant favorite.
Please contact me if you would like to use this in a project. We can discuss the details.