why such small beds?

at a time when human beings, generation on generation, are getting taller and wider, why, like london bus seats, are the hospital beds getting smaller?
patients with chronic back pain, are in beds, that the good men of Alcatraz on their wooden boards and with a single blanket, would find uncomfortable.
the, too small, thin sheet that covers the 4" thick plastic mattress slips straight off the bed and needs retrieving with every turn. a thin blanket and 1 flimsy nylon pillow completes the journey to dream land. no nurse comes near to sort bed out and i hear her tell the patient next door he can sort his own out..and she's too busy..too busy doing nothing from what i saw.
2 days later i'm still asking for an extra pillow to put btw my knees to ease the pain back sufferers will know all too well. a pillow the doctor suggested i have.
i cannot stretch at all......when stretching is needed and part of my treatment.
God save us from the NHS because the staff wont.

i should add to this......3 days later i told a male nurse the bed was impossible to stretch out on..he simply extended it...why did the weekend staff not do that??/was so simple.