We've always struggled with this. My DS is 7 months and will not fall asleep when we are at someone else's house. The last few days have been a bit of a nightmare, as we've spent a lot of time with family and friends, DS will not sleep so will just moan and moan until we eventually have to leave.
He'll fight a bit when we are at home but has a bouncy chair that he'll eventually go to sleep in. Where possible we will bring the chair with us and he'll relax a bit in it but he just know he's not at home so won't sleep.
What do you all do? Please tell me there's a magic trick I haven't tried?