अभाव उभयोः सुप्तौ सर्वैरप्यनुभूयते ।न कश्चिदनयोर्भेदस्तस्मान्मिथ्यात्वमर्हतः ॥ ७६७ ॥
In plain words
In deep sleep everyone experiences the absence of both — no one is exempt from that. And between the two there is not the slightest difference. So both alike earn the verdict: mithyā, false.
Close to the Sanskrit
The non-existence of both, in deep sleep, is experienced by all; and there is not any difference between these two — therefore the two deserve falsity.