One of the things I keep coming back to on this blog is the need for enough decent sleep in the dark. Way back on this blog I mentioned a book - Lights Out - which went into some of the detail:
one of the key problems we face in the world today is that we do not get enough sleep nor - importantly - enough darkness. It looks at how various hormones in the body are promoted by sleep and darkness and how others are released in response to light. The premise is that today we live in an environment where we are almost always in the light. Our bodies and their hormones think we are living in a perpetual summer.
Anyway, Jimmy Moore has just put up an interview with the author of the book. It is worth a listen!
By the way I find Jimmy really frustrating. He is a nice guy and gets some great interviews, but his own diet drives me mad as it is full of artificial sweeteners and "pretend carbs". He could do so much better if he sorted his food out and started exercising a bit more sensibly....but it is his life.