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I'm trying to simulate a circuit with a pair of MOSFETs that switch between grounding a load and connecting the load to a voltage level that is 1.0V above ground. The "high" side voltage of the circuit is 5.0V. When the MOSFET that connects to the 1.0V level is turned on, the simulation does not show the voltage level at the drain pin at the 1.0V level. If I replace the MOSFET with a relay in the schematic, it works as expected. Would a gate to source voltage drop of 4.0 V not be sufficient to connect drain to source?