What type of waves would you likely find in the brain during sleep?

Delta waves are the type of brain waves most commonly associated with deep sleep, particularly during the stages of non-rapid eye movement (NREM) sleep. These waves are characterized by their low frequency and high amplitude, typically oscillating between 0.5 to 4 Hz. During deep sleep, delta activity is prominent, reflecting a state where the body is in a restorative phase, which is essential for physical recovery and immune function.

In contrast, gamma waves are related to conscious thought and cognitive functioning, beta waves are associated with alertness and active thinking, and alpha waves are present during relaxed yet awake states, such as while meditating or resting with closed eyes. Therefore, delta waves specifically indicate the deeper stages of sleep where restorative processes occur, aligning with the characteristics of sleep.