One of your groupmate of myUnisa gives a brief description of the nature of sleep. After the description the tutor says that three statements are incorrect. The tutor then asks you to identify the correct statement about sleep.

1. During sleep, people do not respond to things happening around them.
2. Dreaming occurs during the fourt stage of S-sleep
3. The function of S-sleep is to allow the brain to re-organsie informationand prevent overload
4. Sleep depriviation van lead to deterioration in cognitive functioning