  We estimate the Baryon Asymmetry of the Universe (BAU) produced in an inverse
seesaw model containing extra light singlets, and with lepton number
conservation prior to the electroweak phase transition. An order one CP
asymmetry epsilon is required to obtain a large enough BAU. We discuss the
relation between the baryon and WIMP relic densities in baryogenesis scenarios
using the out-of-equilibrium decay of a baryon-parent of mass M: when baryon
number violation freezes out, the remaining density of baryon-parents is of
order M/m_W times the WIMP relic density. So the baryon/WIMP ratio is or order
epsilon M/m_W. A natural explanation of the similar WIMP and baryon densities
could be that CP violation is of order the ratio m_W/M.
