If you’ve ever woken up to your partner laughing about something you said in your sleep, you’re not alone. Sleep talking—also known as somniloquy—is a common sleep behavior that can range from ...

You wake up to your partner telling you that you had an entire conversation with someone named Bob last night, or your roommate mentions you were giving what sounded like a presentation in your sleep.

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...