Yesterday's planned afternoon session failed to go ahead in order to give the government delegation time to come up with a proposal on the future of the country, an opposition spokesman said.
Earlier the talks had hit an impasse over the formation of a transitional administration.
UN mediator Lakhdar Brahimi admitted the negotiations "haven't produced much" as yet.
There has still been no breakthrough on the issue of getting aid to those remaining in the city of Homs despite an agreeement to allow women and children to leave the besieged city.
The UN is ready to deliver a month of rations to the city for 2500 people once it gets a green light from all sides,
Homs has been a focal point of negotiations between the government and the opposition at the peace talks in Switzerland.