Hi KP
Speaking as someone who spends half his life overseas away from his family...
Phone calls at unexpected times are the answer...
Example...
Your in the USA and she's in the UK, call her at 9am UK time.
She's all... "Isn't it the middle of the night where you are?"
Your all... "Couldn't sleep, thinking of you babe"
Just set your alarm clock, make the call then go back to sleep.
Tried and Tested!
Just adjust for whichever way round the 2 of you are with timezones.