when i had lucy the ferret she would sleep in the same sleeping bag has me keeping my feet warm, but she had this habit of waking up in the middle of the day,( we both stayed awake all night, me online, her ripping my caravan to bits,) and when she woke up it was all teeth and claws running up the length of my body in a mad dash for freedom, after a few goes at that i started wearing cloths in bed because i used to sit bolt upright instictivly when awoken by her, which only trapped her inside the bag, believe me when i say there is nothing worse than a ferret trapped in a sleeping bag with you when you are naked and half asleep lol