... episodes of amnesia 3-4 over the past three month period. The episodes occur prior to taking his dose of ambien, occur usually about 4-5 hours before he takes his dose, and he denies doing anything different or taking any other meds differently than normal. My client found out about the amnestic episode from a text message between he and his son on one occasion. Another time, he was cooking, ate, but woke up in the morning not knowing where the dishes were and what he ate for dinner. Has anyone ever heard about something like this?