One thing's for sure it's different than what you've posted so far :)

I really like the short guitar licks with the da's and do's (2:03)

We have an french artist that often plays that kind of music. He usually has a backup female singer and it does sound really good.

I would really like to hear that song with a female voice. I think it would help the mood even more.

Have you ever tried to mix the song and fade the percussions slowly at the end. Maybe form 2:30 til the end. Only so emphasis the falling a sleep thing. It's hard to go to sleep with a drum beating in your ear :) Just a though

I think fading the percussions joined with the female voice would really bring a special feeling.

She could also whisper more than sing at the end. Like we do in real life with a kid

I would go with female voice, at least try a first draft but I think it would sound really cool.