Do you let cats sleep in your bed?

I don't mind cats on the covers, but I'd be nervous if they were under them with me, in case they got wrapped up in the dvuet when I turned over and panicked!

I used to have a cat called Pansy and I hated her coming into my room at night... she was fine for most of the night but if you moved around, she'd watch your feet under the covers and then bite them gave me a huge fright the first time she did it!