Exhibit 3.4

                            CERTIFICATE OF FORMATION

                                       OF

                                TEMPUR WORLD, LLC

         This Certificate of Formation of Tempur World, LLC (the "LLC"),
dated as of December 29, 2003, is being duly executed and filed by Robert B.
Trussell, Jr., as an authorized person, to form a limited liability company
under the Delaware Limited Liability Company Act (6 Del. C. (S)(S) 18-101,
et seq.).

         FIRST: The name of the limited liability company is:

                                Tempur World, LLC

         SECOND: The address of its registered office in the State of Delaware
is 1209 Orange Street in the City of Wilmington, County of New Castle, DE 19801.
The name of its registered agent at such address is The Corporation Trust
Company.

         IN WITNESS WHEREOF, the undersigned has executed this Certificate of
Formation of Tempur World, LLC this 29th day of December, 2003.

                                            By: /s/ Robert B. Trussell, Jr.
                                                --------------------------------
                                            Name:  Robert B. Trussell, Jr.
                                            Title: Authorized Person



                                State of Delaware

                            CERTIFICATE OF CONVERSION
                  FROM CORPORATION TO LIMITED LIABILITY COMPANY
                               TEMPUR WORLD, INC.

         TEMPUR WORLD, INC., a Delaware corporation, hereby certifies as
follows:

         1. The name of the converting corporation is Tempur World, Inc. (the
"Corporation"), which was originally incorporated on December 16, 1999 under the
name Tempur-World, Inc.

         2. The name of the Corporation immediately prior to the filing of this
Certificate of Conversion is Tempur World, Inc.

         3. The name of the limited liability company into which the Corporation
shall be converted is Tempur World, LLC, as set forth in the Certificate of
Formation of Tempur World, LLC, which is being filed concurrently herewith in
accordance with the Delaware Limited Liability Company Act, as amended.

         4. The conversion of the Corporation to Tempur World, LLC (the
"Conversion") has been approved by the Board of Directors and the Stockholders
of the Corporation in accordance with the provisions of Section 266 of the
Delaware General Corporation Law.

         5. The Conversion shall be effective upon filing with the Delaware
Secretary of State.

         IN WITNESS WHEREOF, the undersigned authorized officer of the
Corporation has executed this Certificate of Conversion as of this 29th day of
December, 2003.

                                        TEMPUR WORLD, INC.




                                        By: /s/ William H. Poche
                                            ------------------------------------
                                        Name:  William H. Poche
                                        Title: Assistant Treasurer