Compared with control children , intervention children had fewer moderate-severe sleep problems at three months ( 56 % v 30 % ; adjusted odds ratio 0.30 , 95 % confidence interval 0.16 to 0.59 ; P < 0.001 ) and six months ( 46 % v 34 % ; 0.58 , 0.32 to 1.0 ; P = 0.07 ) .