Why does my cat suddenly love sleeping in my bed during the day?

Some people might think it's a little gross but my cat loves sleeping in my bed. At night she's not allowed in anyone's room but during the day she loves being in my bed, sleeping, washing herself etc. I've had this cat since I was 7 and she only did this starting a few years ago.

Why does my cat suddenly love sleeping in my bed during the day?
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