Pernix Sleep SC 13D/A Somaxon Pharmaceuticals / MPM BIOVENTURES III-QP ownership change

Exhibit C

JOINT FILING STATEMENT

I, the undersigned, hereby express my agreement that the attached Schedule 13D/A (and any amendments thereto) relating to the Common Stock of Somaxon Pharmaceuticals, Inc. is filed on behalf of each of the undersigned.

Dated: July 20, 2012

MPM BIOVENTURES III, L.P.		MPM BIOVENTURES III-QP, L.P.
By:	MPM BioVentures III GP, L.P.,	By:	MPM BioVentures III GP, L.P.,
	its General Partner		its General Partner
By:	MPM BioVentures III LLC,	By:	MPM BioVentures III LLC,
	its General Partner		its General Partner
By:	/s/ Luke Evnin	By:	/s/ Luke Evnin
	Name: Luke Evnin		Name: Luke Evnin
	Title: Series A Member		Title: Series A Member
MPM BIOVENTURES III PARALLEL FUND, L.P.		MPM BIOVENTURES III GMBH & CO. BETEILIGUNGS KG
By:	MPM BioVentures III GP, L.P.,	By:	MPM BioVentures III GP, L.P.,
	its General Partner		in its capacity as the Managing Limited Partner
By:	MPM BioVentures III LLC,	By:	MPM BioVentures III LLC,
	its General Partner		its General Partner
By:	/s/ Luke Evnin	By:	/s/ Luke Evnin
	Name: Luke Evnin		Name: Luke Evnin
	Title: Series A Member		Title: Series A Member
MPM ASSET MANAGEMENT INVESTORS 2005 BVIII LLC		MPM BIOVENTURES III GP, L.P.
By:	/s/ Luke Evnin	By:	MPM BioVentures III LLC,
	Name: Luke Evnin		its General Partner
	Title: Manager
		By:	/s/ Luke Evnin
			Name: Luke Evnin
			Title: Series A Member
MPM BIOVENTURES III LLC
By:	/s/ Luke Evnin		/s/ Luke Evnin
	Name: Luke Evnin		Luke Evnin
	Title: Series A Member
	/s/ Ansbert Gadicke		/s/ Nicholas Galakatos
	Ansbert Gadicke		Nicholas Galakatos
	/s/ Michael Steinmetz		/s/ Kurt Wheeler
	Michael Steinmetz		Kurt Wheeler
	/s/ Nicholas Simon III		/s/ Dennis Henner
	Nicholas Simon III		Dennis Henner