You are trying to access subscriber-only content.

If you are a subscriber, log in here.

If you are not a subscriber, or are only subscribed to the print edition, click here to subscribe now. Digital subscribers have unlimited access to our magazine articles and more!

Q: I can understand that too little sleep is a problem, but I’ve read that oversleeping isn’t healthy for the brain either. Why? A: Like so many things in life, it’s possible to have too much of a good thing—sleep, in this case. While insufficient sleep is a more common and potentially more harmful problem, […]