Why do people talk in their sleep?

 Some people talk in their sleep . It is known as sleep talking but what cause it ? Actually sleep can be divided into 4 stages . The first three stages are of Nrem sleep. None-rapid eye movement sleep, stage one awake /light sleep . Stage 2 moderate sleep, stage 3/4 deep sleep.

And then is 4 Rem sleep , In this stage you dream and your eyes move rapidly. This is why it is known as rapid eye-movement sleep . you spend about 4-6 hours a night in Nrem sleep and 1.5-2 hours in Rem sleep.

At any stage or during Rem sleep, sleep talking is possible. Normally when you dream your brain deactivates , your motor neurons so that your limbs do not move while you dream . For this , powerful neuro-transmitters are released but if there a failure in releasing the neuro-transmitters your body makes some movements.

Such as moving the lips and vocal cards which cause you to talk while sleeping . Generally sleep talking has been linked to high levels of stress and anxiety and caffeine a lot of screen time right before going to bed increase the chances of sleep talking .