Why Do People Feel ‘Grouchy’ in the Morning?

You feel grumpy in the morning because your body is still sleepy. When you wake up, your brain needs time to start working again. It also sends a message that tells your body it's time to get ready for the day, but that message takes a while to arrive. In the meantime, your brain feels tired and cranky. That’s why you might feel like a grumpy bear in the morning!

Your body has something called hormones, which are like tiny messengers. When you're sleeping, your body sends out a hormone called cortisol to help you wake up. But sometimes it takes longer than usual for that message to get through, making you feel extra grumpy.