[qamplor]

You are assuming there is no contiguity of self during sleep, but present no evidence for this idea. There's plenty of evidence, however, that sleep is closer to an altered state than a cessation/reset of state. The brain is intact and active during all stages of sleep. We dream every night and merely forget most of them, and remembered dreams are certainly contiguous with waking consciousness.

The analogy between "sleep" in biological brains and "sleep" functions in modern operating systems is only that - an analogy.