To provide a muffler for sound sleep for sleeping comfortably and rising with a fresh feeling by warming the neck and the hands and feet when it is impossible to go to sleep because the neck and the hands and feet are cold in sleeping in winter.

This muffler comprises a muffler body formed by sewing a lightweight textile material with excellent heat insulating property into band shape with a width of about 10-12 cm and a length of about 60-90 cm, and a holding means disposed on one end side of the muffler body to hold the other end side so that the muffler body is brought into close contact with the neck.