A couple of times during the night, you awaken slightly. Each time you awaken, you're aware of vague mental images that reflect a conversation you and your boss had about resolving a problem at work. These bland, thoughtlike ruminations about real events that occur during NREM sleep are best described as:

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The vague mental images reflecting a conversation about work that occur during NREM sleep are characteristic of sleep thinking. Hypnagogic hallucinations occur during the transition from wakefulness to sleep, dreams occur during REM sleep, and somnambulism (sleepwalking) involves physical activity during sleep.

A Couple of Times During the Night, You Awaken Slightly