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Letters to the editor

Sleepless on schedule
The article “Full moon may mean less sleep” (SN: 8/24/13, p. 15) brought up a very interesting hypothesis that besides a 24-hour circadian clock, we may also have a lunar clock. To me that makes sense. Just like our bodies can store fat to use when food sources run low, I imagine over the eons our bodies prepared subtly to use the extra light to do more if needed. Taking  advantage of extra light on a fixed schedule no doubt evolved in our ancestors and remains with us to this day. 
Linda McBride, Boynton Beach, Fla.

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