hmmmmm how do you keep your kids in the rear facing seats for so long!!???

my dd is 5 months and i cant wait to turn her around, she is constantly lifting and straining her head trying to see out and escape from her seat. i think she will be a lot happier once she can see out and about when she is facing forwards.

just wondering if they still fall asleep when facing forwards, or does their head fall to the side/forward akwardly???
Jovie often has a look around & lifts her head up to have a gawk at something Matilda is doing. But I guess to me the evidence weighs heavily on me.