Today we looked at the second evolutionary explanation - energy conservation. Sleep is constrained by predator risk, and research found that prey animals sleep less than predators, presumably for this reason. This reason isn't wholly satisfactory for various reasons - we discussed the fact that evolutionary arguments are non-falsifiable, and in this case can be used to prove entirely contradictory behaviour (eg you could argue that staying asleep is a good way to avoid predators).
The powerpoint is the same as yesterdays, on the previous blog post.
Don't forget to bring your sleep diaries in next Tuesday (21st).
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