'Sleeping' in the Bible

So again, if two are sleeping together they are warm, but how may one be warm by himself?

When I tried to gain wisdom and to observe the activity on earth -- even though it prevents anyone from sleeping day or night --

Furthermore, in your bedchamber do not curse a king, and in your sleeping rooms do not curse a rich man, for a bird of the heavens will carry the sound and the winged creature will make the matter known.