Every fall my father has to fight a little harder to get his dog, Alpha, out of bed in the morning. As long as it is dark outside, she won't budge. Her energy starts to flag earlier in the evenings too: if her people won't call it a night early enough, she attempts to herd family members toward bed. Although perennially amusing, Alpha's shift in schedule is completely understandable given the shorter days. We humans may be feeling the effects of less daylight too. As well, th