Final answer:
Sleepwalking and talking in your sleep typically occur during stage 3 of non-REM sleep, known as deep sleep, marked by delta waves (b). Sleep spindles and K-complexes are associated with stage 2 sleep and are not directly related to sleepwalking.
Step-by-step explanation:
Stages of Sleep and Sleepwalking
You asked about the stage of sleep during which you may walk or talk in your sleep. This behavior is commonly associated with stage 3 of non-REM sleep. During this stage, also known as deep sleep or slow-wave sleep, the brain produces low frequency, high amplitude delta waves. This makes it much more difficult to awaken someone from sleep. While some people claim that sleepwalking and talking during sleep may involve acting out dreams, this is unlikely because such behaviors occur during non-REM sleep, when dreaming is less common compared to REM sleep.
Sleep spindles and K-complexes are brainwave patterns associated with stage 2 sleep. These patterns may play an important role in learning and memory. However, the occurrence of sleepwalking and talking in one's sleep is much less likely in this stage compared to stage 3.