Refers to a piece of furniture for sleeping, typically Western-style. For traditional Japanese futons, 布団 is used.
I bought a new bed.
He is reading a book in bed.
I got sleepy, so I went to bed.
I get up out of bed at seven every morning.
I made the bed before going out.
I was tired, so I lay down on the bed.
charpoy; woven rope bed