Good sleeper is nightmare away from home

[OuiOui]

Our 20 month old ds has been a great sleeper since 1 year old. he settles himself practically waves goodnight and is happy even if 3 year old sister makes noise.
However away from home he cannot sleep well. We go away quite often and he always sleeps in our pwn travel cot which he is familiar with and his sister takes the hotel one. (The state he got in when he was put in a hotel one - unimaginable terror).

The last few trips he has happily burbled away and taken about 10-20 mins to settle whilst we just ignored him and he went to sleep. However he cannot sleep through the night. he wakes around 3am and will scream to be let out which of course we do - it's 3am! but then he's tired and he can't settle in our nbed as thta's too exciting for him - he'll crawl around playing for another hour but be really grumpy and will eventually collapse again. anyone else experience this?

We love going away but I always dread the fatigue and the tension this creates in our room.

This weekend we're actually taking his cot mattress and outting it into the travel cot - hopefully will help but we can't take it onto the plane for the long haul holiday in March!!!

Not expecting any miracle answers just anyone have the same - when do they settle out of this?