The bed is too short to stretch out on, the blanket too narrow to wrap around you. (NIV)
For [they will find that] the bed is too short for a man to stretch himself on and the covering too narrow for him to wrap himself in. [All their sources of confidence will fail them.] (AMP)
For the bed is shorter than that a man can stretch himself on it: and the covering narrower than that he can wrap himself in it. (KJV)