  A recent study demonstrated the existence of oscillons -- extremely
long-lived localized configurations that undergo regular oscillations in time
-- in spontaneously broken SU(2) gauge theory with a fundamental Higgs particle
whose mass is twice the mass of the gauge bosons. This analysis was carried out
in a spherically symmetric ansatz invariant under combined spatial and isospin
rotations. We extend this result by considering a numerical simulation of the
the full bosonic sector of the $SU(2)\times U(1)$ electroweak Standard Model in
3+1 dimensions, with no assumption of rotational symmetry, for a Higgs mass
equal to twice the $W^\pm$ boson mass. Within the limits of this numerical
simulation, we find that the oscillon solution from the pure SU(2) theory is
modified but remains stable in the full electroweak theory. The observed
oscillon solution contains total energy approximately 30 TeV localized in a
region of radius approximately 0.05 fm.
