What does voy a la cama mean in English?

Literally, I'm going to the bed. Figuratively, I'm going to bed, Maybe: I'm going to take a nap. Maybe: I'm going to lay down.
It's usually used with a purpose in mind, and stated, such as Voy a la cama a sentarme. I'm going to the bed to sit down. Voy a la cama a estudiar - I'm going to bed to study.