Yes, it's very difficult to understand the logic of Lisa's actions in this apt. They could've just organised a small party with all of them tonight instead of going out again. It could've brought some life to this place.
I guess if Em and Sid stay there tonight, Lisa and Chloe will come back at 2:00 am ( as usual ) and will sleep together on the couch.
Sinds the return of Sid, i've noticed that Lisa is being sidelined. Sid and Em are sleeping in the BR while Lisa has to fill the couch. And Em is bringing new stuff every time to decorate the LR and the BR.