On The Bed Again-With Permission

With the extremely cold conditions we are currently experiencing, some in the negative numbers at night, I have been allowing Rowdy up on the bed so he can stay warmer, than leaving him to sleep on the floor on his blanket.  Because of this, I may have trouble having him back on the floor and may have to deal with him getting on the bed without being allowed.  

He can still go down to the den and get on his pillow in the corner, or up on the couch which he prefers, but he is not in the same room as me which he also prefers.  

What Are You Doing On The Bed--Update

For over a week, Rowdy hadn't got on the bed, after the last episode I wrote about.  Now for the last four nights at around 5 to 6 AM, whenever I get up to go to the bathroom, he has got off his blanket and jumped up onto my place on the bed.  When I come back into the room and with an angry tone of voice, I tell him NO and to get down.  He only hesitates for a second, before he jumps down and that's that for the night.  What am I gonna do with him to get him to stop?!?!