[adamweld]

It's probably not going to be possible to completely silence your neighbors, but I'm sure there are a few things you can do to make a difference.

If noise is transmitted through the floor, add thick carpet and support your bed with a vibration deadening material, e.g. something viscoelastic. Sorbothane is popular for this but you'll need to spread the load out or pick a high durometer (stiff) rubber.

For the walls, hang up some carpets or similar, and/or hang heavy material around your bed as a canopy as you suggest. What you want is a material that's heavy enough that the energy in the sound waves is dissipated trying to move it around. Maybe a weighted blanket, or a duvet cover stuffed with mass loaded vinyl (used in cars for sound deadening).