स्टेज 1 NREM नींद की विशेषता मुख्य रूप से किस प्रकार की मस्तिष्क तरंगों से होती है?

Which theory proposes that animals and humans evolved sleep patterns to avoid predators by sleeping when predators are most active?

Match the brain wave types with their corresponding descriptions: A. Beta waves – (iv) Smaller and faster brain waves, typically indicating mental activity. B. Alpha waves – (iii) Brain waves that indicate a state of relaxation or light sleep. C. Theta waves – (ii) Brain waves indicating the early stages of sleep. D. Delta waves – (i) Long, slow brain waves that indicate the deepest stage of sleep.