I went through this after the 9/11 and anthrax response finally wound down. Your mind and body get used to producing performance at a certain rate. It takes a while for it to settle, again.
What I tried to do is put together a bed-time ritual routine. You kinda have to decide you're going to go to bed at a certain time each night. And about an hour before, you start doing things to prepare for bed. (Starting off with a nice cup of herbal tea is a good signal.) It basically is retraining your mind into understanding that it doesn't have to keep going at the same level. So cup of tea means bed. Or taking a shower means bed. Or whatever.
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What I tried to do is put together a bed-time ritual routine. You kinda have to decide you're going to go to bed at a certain time each night. And about an hour before, you start doing things to prepare for bed. (Starting off with a nice cup of herbal tea is a good signal.) It basically is retraining your mind into understanding that it doesn't have to keep going at the same level. So cup of tea means bed. Or taking a shower means bed. Or whatever.
Good luck!