Does the thread of you your consciousness end when you go to sleep?

Does the thread of someone elses consciousness ends when they experience grand mal seizure and thrir electrical brain activity goes wrong all at once and then resets?

How's "waking up" in the virtual different from waking up from grand mal seizure? (assuming that all relevant biochemical data of neurons was read correcly and their behavior is simulated correctly)

No because you know it was you who was in deep sleep And just woke up