Sleep talking can be a slightly strange experience — whether you’re the one doing the midnight chattering or you’re sharing a bed with someone who is talking mid-snooze. But what is sleep talking and ...

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, ...