Step 21: Poor Man's Futon, Grounded on one Side
To get extra fancy you can sew the covers together so it folds up in a hinged-couch fashion.
That will keep the cushions from drifting apart under you when you sleep. Otherwise a piece of cord tied around them will do the job, or most likely there will be enough stuff in your lab to block them in place.
In case your janitors or labmates aren't good at cleaning, you might want to pick one side that goes on the floor and another side for yourself. Mark Tobenkin of MIT had the bright idea of marking the ground side of the cushion with the "ground" schematic symbol.
After a few years your bed might get kind of dingy. You can usually take the covers off and launder them. If that isn't enough, scavenge some latex paint and paint them. That works for upholstered furniture in general. Go nuts and paint them with sunflowers, dragons etc. Remember,
reduce, reuse, recycle, relax, recreate!