You might look up Dr Gominak on Youtube. She figured out that higher levels (60 - 80) of D3 correspond to much better sleep. It worked for me and that first n

You might look up Dr Gominak on Youtube. She figured out that higher levels (60 - 80) of D3 correspond to much better sleep. It worked for me and that first night when you get good sleep is just amazing. Her website has all the specifics.