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Howard G. Smith, M.D. is a former radio medical editor and talk show host in the Boston Metro area. His "Medical Minute" of health and wellness news and commentary was a regular weekday feature on WBZ-AM, WRKO-AM, and WMRE-AM. His popular two-way talk show, Dr. Howard Smith OnCall, was regularly heard Sunday morning and middays on WBZ.

Dr. Smith has adopted audio and video podcasting as conduits for HEALTH NEWS YOU SHOULD USE. Based on the latest medical, health, and wellness literature these reports provide practical information you can use to keep yourself and your family healthy. Many reports have video versions, and Dr. Smith’s YouTube Channel may be found at:

Trained at Harvard Medical School and a long-time faculty member at Boston Children’s Hospital, he practiced Pediatric Otolaryngology for 40 years in Boston, Southern California, and in central Connecticut.  He is now based in New York City.

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Mar 9, 2019


Deep sleep, the slow wave, non-REM variety, is the best sleep for literally cleansing your brain according to a new study from the University of Rochester.  The scientists studied the effects of deep sleep in a mouse model inducing that state with the unique combination of general anesthetics ketamine and xylazine.

The combination of deep slow wave sleep and the low level cardiovascular activity that accompanies it triggers the so-called glymphatic system, the brain’s unique plumbing apparatus that flushes waste from our brain cells.  This essential purging fails to occur during sleep deprivation and is also less likely to occur as we age when it becomes more difficult to achieve deep sleep.   

Other studies suggest that the onset of Alzheimer’s is associated with less deep sleep and this may be due to poor glymphatic system activity.

You can help yourself get deep sleep at any age with the following tips.  Before bedtime: no eating, caffeinated beverages, exercise, blue light exposure.  While you sleep: keep room cool @ 60-68 degF; keep your nose clear with saline mist; keep air humidified.  Always: maintaining a regular wake-sleep schedule.

#deepsleep #nonREMsleep #slowwavesleep #braincleansing #sleepdeficit #glymphatic

University of Rochester Medical Center. "Not all sleep is equal when it comes to cleaning the brain." ScienceDaily. ScienceDaily #27 February 2019. <>.