Refers to the physical place where one sleeps, such as a futon, mattress, or sleeping area. Can also mean a bedroom in context.
I was tired, so I went straight to bed.
The children are reading books in their sleeping place.
My grandmother gets into bed at nine o'clock.
It's cold, so I don't want to get out of bed.
My mother makes my bed every morning.
I was tired, so I went to bed early.