Final answer:
David is likely experiencing night terrors, a parasomnia characterized by panic and screaming without recollection of the event.
Step-by-step explanation:
Based on the description given, David appears to be experiencing night terrors, a type of parasomnia which is a sleep disorder characterized by panic, screaming, and attempts to escape the immediate environment during sleep. Night terrors are distinguished from nightmares as they typically occur during the NREM phase of sleep, with individuals having no recollection of the event after they occur. Unlike sleepwalking, where a person might engage in complex actions, night terrors mainly involve a sudden reaction of fear. Treatment for night terrors is usually not necessary unless they are caused by an underlying condition.