aging

My dog has been behaving strange recently. He always sleeps with my mom at night and for some reason he started to sleep in strange places like above her head or started to walk around her head. Also, when this happen and my mom tells him to go away he starts walking arround the house...

My problem is the exact opposite of most, I WANT my dog to know it's ok to go inside the house. I'm gone all day for work, there isn't anyone to let my aging dog out, neighbors are not an option, I can't afford off-site day care or the cost of having someone come by and let him out. Before I...