Before you leave the house you have no option, no couch, no Janette, no park.
Reading the Laura-Oliver dialogue, in my opinion Laura feels so offended and upset that, at that moment, she is no longer sleepy and certainly does not want to go to sleep on the sofa. So a sentence said to Oliver: "I'm going to sleep on the couch!" would be out of tune. At that moment Laura is so pissed off that she needs "something else." Here maybe what she's looking for maybe either in a scene with Janette-bar-Berta(BDSM,drunken dream), or park, (drunk), she didn't get