This might be late for you, but maybe it will help others.
- have 2 copies of a book, one for you and one for child. Read the book over the phone to the child as a part of bedtime routine.
- have a picture of you the child can look at anytime, especially when talking on the phone
-have a calendar of some sort that shows the days you will be gone. Have the child check off each day before bed so he can see when you will be back.
-make sure that the sitter/grandma keeps at least a few things from his routine at home. It can be the order of bed time routine, the way his lunch sandwich is cut, etc. Something that is familiar and comforting to him.
- Remember that 4 year olds can do just fine on overnights. If you act in front of him that it is going to be a fun thing to do then he will enjoy it more. If you act worried and sad, he will think he should be too. Most likely he will enjoy himself and barely know you are gone.
Good luck and try to enjoy your trip
State Certified Early Childhood Special Education Teacher
New Mom as of March 2009!