Do you want to drift off to sleep along with the music? I belive this pillow should be the best gadget for it.
This hybrid gadget is named as Mu Space, designed by Yuan-Hao Hsu & Lin Tzu Hsuan. Mu Space integrates various elements, including boombox, MP3 player, and sleep pod, but it can be carry more conveniently. Unfortunately MU Space is just a design concept. We have to wait the gadget available for a quite long time.