Bear wrestling in his sleep? 3:30am musings... again

I think my husband wrestles bears in his sleep.  I put clean sheets on the bed last night before going to bed... including fitted sheet, flat sheet, no less than six pillow cases, and the comforter.  I don't do military corners or anything... I just tuck in the bottom of the sheet, and call it done.  This morning, I woke up to the flat sheet all wadded up in the middle of the bed, and the comforter equally in a ball on his side.  How does this happen?  Seriously, do we have to tear apart the bed in the middle of the night?  Trust me, there was to 'good' reason to tear the sheets off the bed.

How are the bears getting into the bed, and where do they go in the morning?  Why do I never see or hear or wrestle the bears?  Are they so stealthy that they only attack my husband, and leave me to my own peaceful-sleeping devices?  Ok, I know that one's not true, cause we have a baby, so I don't usually sleep through the night.  Is there anything that we can do to get rid of the bears?  How long will they stay, and are they capable of doing laundry while they're here?