OHGrandma,
Thank you for the link on Sleep. I have learned to recognize when DH is changing cycles by his sleep patterns. Also, when his sleep schedule changes so does his eating pattern. In fact, I've had a bit of luck in seeing that his sleep pattern is changing and calling him on it. If he is able to get his sleep pattern back to "normal" it seems to lessen the extremes of the cycle.

It was reassuring to read that research is backing up my intuition smile