Which type of wave is commonly present during light sleep?

Theta waves are commonly present during light sleep, specifically during the stages of sleep that occur as one transitions from wakefulness to deeper sleep, such as NREM (Non-Rapid Eye Movement) sleep. These waves have a frequency range of 4 to 7 Hz and are associated with the lighter stages of sleep, relaxation, and daydreaming. During light sleep, the brain becomes less responsive to external stimuli, and theta waves signify this shift from active wakefulness to a more restful state. As a result, this type of brain activity plays a crucial role in the overall sleep cycle and is foundational for deeper sleep stages that involve delta waves. Recognizing theta waves as indicative of light sleep helps to understand sleep architecture and the importance of each stage for overall health and function.