My hp laptop

I am feeling sombre.
Or rather I am having a nightmare in a nap.
I may be short but I'm big or rather wide.
I wait for my friend to play with me and make me happy.

I always sit or sometimes stretch.
I can't stand, but if you count
Standing with a cripples back, then I can stand.
But when I'm sorrow, I am extending my stretch.

When I travel to the seas,
Oh please, let me stay away from the waters.
I can't handle liquid, cold or hot,
But when I have clothing, I feel safe.

I may be rough, I may be tough, but
Believe me, I give you light.
The light's not evil nor harmful, but
I feel happy. The light can be tinted, from black to white.

I sometimes travel from places to places, or I just simply
Live on a desk, table or floor. I have 90 ~ 100 buttons,
And I have short, tiny organs. I'm always useful in many
Ways, like a dictionary or a playmate/friend.