sleep sitting up in an armchair or couch. try and get as vertical as possible. see how that works out one night, you might have to take ladys slipper to make yourself drowsy enough to get used to this new sleeping position.
Lady's slipper is a great herb. It is one of the few things that I found that will put me to sleep. But it is very strong, so people should start out with small doses, especially if they are sensitive to herbs.
Also, it is getting really hard to find since it is becoming endangered. It was up to $60 a pound wholesale years ago when it was taken off the general market due to becoming scarce. There are still a few wildcrafters though that collect it and offer the tincture.