Participants
Nulliparas (no prior pregnancy beyond 20 weeks), aged ≥ 18 years, singleton pregnancy between 34 to 36 weeks gestation with self-reported night sleep of less than 6 h [Eligible women who attended antenatal clinic for regular follow-up were approached, assessed for eligibility, provided with the patient information sheet and verbally counselled with regard to trial participation by an investigator (co-author AV). Written consent was obtained from all participants.