dr. winston chung you with us in the studio to talk about why quality sleep is to critical to our health.e is medical director of inpatient psychiatry at california medical center and works at the guisal school of medicine. nice to have you here. >> thank you for having me, cheryl. >> you went to med school, you're a doctor u. probably didn't sleep at all. >> there were a lot of nights without much sleep, correct. >> but it's so important to have a good, quality sleep. sleep hygiene is the new phrase, i think. >> absolutely. very important. simply put, restful sleep is critical for our mental and physical functioning. you described some of the ways that poor sleep can impact us physically, but certainly our mind throughout the day is involved in a lot of activities, planning, organizing ourselves. when we drive behind the wheel, if we lose hours of sleep at night, that can impact our ability to function in that way, in an appropriate manner. >> it's important to just shut the brain down for a while? >> yeah. our brain is very busy during the day, and in a certain sense our brain goes into