Sleep during meditation

The sleep which you felt when meditating was not sleep but an inward condition of the consciousness. When this inward condition is not very deep one can be aware of various scenes, voices etc. which belong not to the physical but to some inner plane of consciousness—their value or truth depends on the plane to which one reaches. Those of the surface are of no importance and one has simply to pass through them till one gets deeper.

Ref: Letters on Yoga III