IRCT20121006011020N13 IRCT 2020-10-28 Tehran University of Medical Sciences Comparison of delivery rate and duration of labor in sleeping versus sitting position in women undergoing epidural analgesia Comparison of delivery rate and duration of second stage of labor in sleeping versus sitting position in nulliparous women undergoing epidural analgesia 2020-08-10 anticipated 528 Complete https://irct.ir/trial/48305 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: Our sample size is 528 people, with 264 people in each group. The Block randomization method was designed by Epithemiologist using www.sealedenvelope.com. The number of blocks considered is 4, Blinding description: The type of intervention was written in the envelope and arranged based on the black randomization list, each time the Dr confirmed that the patient was eligible, the envelope is given to the Dr by the midwife who is no person in the research. the mother and the Outcome assessor are aware of the intervention and the statistical analysis is done by someone who is unaware. N/A Labor. Intervention 1: Intervention group:The first group has a standing position (standing or sitting position) in full cervix dilatation until delivery then gives birth in a lithotomy position. Intervention 2: Intervention group:The second group has a lying position (into left, right or back) in full cervix dilatation until delivery then gives birth in a lithotomy position. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is We have no decision about it.