  We propose an appealing alternative scenario of leptogenesis assisted by dark
sector which leads to the baryon asymmetry of the Universe satisfying all
theoretical and experimental constraints. The dark sector carries a non minimal
set up of singlet doublet fermionic dark matter extended with copies of a real
singlet scalar field. A small Majorana mass term for the singlet dark fermion,
in addition to the typical Dirac term, provides the more favourable dark matter
of pseudo-Dirac type, capable of escaping the direct search. Such a
construction also offers a formidable scope to radiative generation of active
neutrino masses. In the presence of a (non)standard thermal history of the
Universe, we perform the detailed dark matter phenomenology adopting the
suitable benchmark scenarios, consistent with direct detection and neutrino
oscillations data. Besides, we have demonstrated that the singlet scalars can
go through CP-violating out of equilibrium decay, producing an ample amount of
lepton asymmetry. Such an asymmetry then gets converted into the observed
baryon asymmetry of the Universe through the non-perturbative sphaleron
processes owing to the presence of the alternative cosmological background
considered here. Unconventional thermal history of the Universe can thus aspire
to lend a critical role both in the context of dark matter as well as in
realizing baryogenesis
