Unfortunately no.
But I can recommend the following products:
Hama Pocket 2.0 (10 h, 10 m, battery operation)-> a small active speaker with good sound and the option of connecting it by cable (unfortunately it makes loud noises when switched on and off).
and
Panasonic RP-HJE125 (wired)-> a fine in-ear headphone that goes with the smallest attachments even for children's ears. The cable is very fine and makes little noise when touched. I often use these myself to fall asleep together with the Sansa Clip.
The clip is really great. To fall asleep, simply create a go list, switch on automatic switch-off, set the screen timeout to short and set the equaliser to maximum quiet....