Matthew Poole and continuators on Isaiah 28:20

20. 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 .

For those lying Refuges, to which you trust, will not be able to give you that Protection and Comfort, which you expect from them; no more than a man can stretch himself (as these luxurious Israelites used to do, Amos 6. 4.) upon a bed which is too narrow for him, or wrap and keep himself warm, with a covering or bed cloaths, which are not large enough for him.

Marginal references: Heb. narrow when he wrappeth himself.