Which preposition to use with shakedown

of Occurrences 1%

M.B. Which might be translated "Pitton de Tournefort when tired for the day, In this hole made his bed, on a shakedown of hay.

under Occurrences 1%

She also expressed her willingness to sleep in the back kitchen: a shakedown under the sink was all she wanted.

Which preposition to use with  shakedown