At 3, your child is speaking in full sentences, asking "why" about everything, engaging in complex pretend play with storylines, developing friendships, understanding rules and routines, and beginning to grasp concepts like sharing, taking turns, and basic empathy. They can dress themselves partially, use the toilet during the day, and follow multi-step instructions.
The imagination that produces nighttime fears also produces incredible creativity during the day. Your child can now create entire imaginary worlds, assign roles to stuffed animals, and narrate elaborate scenarios. This cognitive explosion is demanding — and it's one reason why rest (even without sleep) during quiet time is so important. The brain needs downtime to consolidate the enormous amount of learning happening every day.
Emotional regulation is still developing. Tantrums continue (though they're beginning to decrease in frequency if not in intensity), and your child is learning to use words instead of actions to express frustration. Bedtime can be a flashpoint because it requires your child to stop the activities they enjoy and submit to a transition they didn't choose — which is a regulation challenge.