Billi just started doing that about a month ago... She only does it during the day when the ac is blasting, so I figure it's warmer, darker and quieter for her. Sometime's she hides there nor too before bathtime. Thankfully we have the majority of it blocked off so she only has about 6 inches to hide..
__________________  [I] Dani: Happily owned by Billi-Jane & Witten 
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