Man Monica, just reading that one of your cats sleeps under the covers and one on top makes me miserable! Our female, Tula, we caller her the thermonater, can feel like about 80 lbs when she's laying up against you. You move and she moves with you, doesn't budge. She makes us so hot, we wake up in a sweat! She's a small cat too!
My husband usually doesn't have the heart to move her (er disturb her), but the other night she had him pinned and he decided to give her a dose of her own medicine and laid the extra blanket over her and "smoked" her out and off of the bed

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Angie
Poppy - Timneh (doh 10/22/06)
Ziggy - Green Cheek (doh 1/2/07)
Paris - Timneh (passed Oct. 2006)
Ra & Tula - felines
http://www.poppythetag.com/