Why does kiwi sleep during the day

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The kiwi lives only in New Zealand. It is a very strange bird because it cannot fly. The kiwi is the same size as a chicken. It has no wings or tail. It does not have any feathers like other birds.

A kiwi likes a lot of trees around it. It sleeps during the day because the sunlight hurts its eyes. It can smell things with its nose. It is the only bird in the world that can smell things. The kiwi's eggs are very big.

There are only a few kiwis in New Zealand now. New Zealanders want their kiwis to live. There is a picture of a kiwi on New Zealand money. People from New Zealand are sometimes called ‘Kiwis’.

Question: Why does kiwi sleep during the day?