I also have this issue . She sleep in the sarong day and night too .
So now i do not bring her out and she is coming to 6 month old .
She only goes to places like my parents place and nanny place which have yaolan.
During days for injection , i will put her inside the stroller and let her sleep awhile first before bring her up the car ,if not very cranky .
Maybe you can try this method . Let her sleep in the stroller for 30-45min before the car ride .
I tried to wean her out of the yaolan using CIO but failed . I gave up . Let her be .
I pray for the day when she grow up and wean herself out of the yaolan .
Me and hubby's totally lose our freedom because of this but we are happy to have her and stay at home to play with her . Every now and then , we will give each other a break to go out with friends .