Why I feel difficult to sleep???

My mummy worried about me.  I like to play all night long till my mummy felt tired.  I love to play with thing that is not a play thing.  I like to see different thing.  Last night my mummy stayed with me at the reading room.  I like the environment.  Staying on the bed while playing with hanger.  Dont' know why.  After I tired enough, get some milk from my mummy, then I sleep soundly.