The user has various positioning cushions in bed at night:
– Psoas cushion when she lies on her back
– A long narrow wedge cushion (support cushion) to position her feet when she is on her back with the psoas cushion
– Wedge cushion, under back when she lies on her side
High position with psoas cushion increases circulation when she lies on her back. The wedge cushion helps her maintain a stable position when she lies on her side.
for example jarven.se (last checked March 2020).
This tip is from 2008