Explain why a twilight state can be clinically easy to miss, despite involving a genuine disturbance of consciousness.

A twilight state is easy to miss precisely because behaviour remains relatively well-ordered and purposeful throughout the episode — there is no obvious confusion, disorganisation, or florid disturbance to alert an onlooker that anything is wrong. A person in a twilight state can walk, respond to their surroundings, and even carry out fairly complex actions, all while consciousness is genuinely, morbidly restricted and later recalled as a complete gap. Without a witness account of the episode itself, or without specifically asking whether there was a break in continuity with a clear onset and end, a clinician relying only on the patient's calm, composed presentation afterwards could easily fail to recognise that a significant disturbance of consciousness took place at all.