A large body of research suggests vitamin D impacts sleep quality and sleep duration as well as neurotransmitter levels in the brain. Here's an overview of the latest science--which is timely if you live in norther latitudes.

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Link to images, science and video: http://bit.ly/vitamin-d-sleep-science

Episode Time Stamps:

0:00 Intro
1:37 Vitamin D and Sleep
2:07 Dr. Stasha Gominak, MD Vitamin D and Sleep Podcast
2:16 Vitamin D and Gut Health
2:31 Vitamin D Metabolism Basics 
4:56 Factors that impact vitamin D levels
5:54 Optimal Vitamin D levels
6:42 Classical VS Non-Classical pathways linked with Vitamin D 
8:05 Vitamin D and sleep details
8:31 Vitamin D and sleep disordered breathing
9:05 Vitamin and sleep details
10:16 Vitamin D and Circadian Rhythms
11:00 Dosing Vitamin D at night
12:38 Vitamin D and Brain Development
13:45 Vitamin D is very important for children
14:57 Big picture re: Vitamin D and sleep
15:47 Vitamin D Blood spot test
16:13 Optimal Vitamin D levels this winter
16:50 Dosing Vitamin D prior to bed
17:52 Vitamin K and Vitamin D