A recent study observed sleeping participants' pupils during sleep, using a new method that could have implications for studying sleep disorders. reading time 2 minutes Though sleep is a time to power ...

Dear Lucas: Lately, my husband has been talking in his sleep, which wakes me up and seems to indicate he isn’t sleeping very well. He has reluctantly agreed to go to the doctor, but that appointment ...

Have you heard the saying about “sleeping with one eye open”? It’s a bit of metaphoric advice about staying vigilant—and a way to describe very light restless sleep. But sleeping with eyes open is ...