Who is singing?

I hum and sing all day
Once I was singing when I was asleep.I  remember the tune now
.I can read extremely quickly.But prefer slowly
I have lost my coordination and got clumsy
I like getting into bed when I am tired and  the bed is warm
My skin has gone all crinkly
I feel young at home
I feel  like a cripple when out.
I used to sing for our cat ; she  lay on a rug by the kitchen door
When I finished and sat down she would jump onto my lap and go to sleep
If I listen I hear the songs are connected to my concerns of the day like dreams are
Who is singing?