What is the normal penalty a character receives to their perception scores while sleeping?
Characters are implied to have limited ability to use their perception skills while sleeping. The advantage Light Sleeper explains that a character who possesses it receives "only" a -20 to Notice while sleeping, implying that the normal penalty is greater. Meanwhile, the disadvantage Deep Sleeper gives a character a staggering -200. Clearly, the default state is somewhere between these two values.
This default value does not seem to appear in the advantages/disadvantages section around Light Sleeper or Deep Sleeper, nor in the Secondary Abilities section around the Perception skills (despite having a chart of modifiers where it would fit nicely), nor in the States and Accidents section detailing status effects. Where can I find this value?