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"We talked until the sun rose in the sky."
See, that's where I know he lied. Ambien does shunt you into a dream state, ready or not, but there's a window of effect. The reason why they're now marketing an "extended release" is that after a few hours, it's pretty much out of your system. Even mixed with drink, after the initial spike (during which you're supposed to fake sleep until it's true), the effect fades... as does the memory-fog.
At least for the marathon session, he remembered what he said, Sam just didn't want to follow through.