Again, the remedy is simple: don't stress about rapid response to email and, if you're a manager, let it be known that rapid responses to email aren't required. Especially outside working hours.
We used to call this the CrackBerry Syndrome. When the CrackBerry came out, the "I will respond immediately" proved so addictive that people could not live without it - I was seeing people on flights mindlessly fiddling with the control wheel on their CrackBerry just to continue the always-on feeling. The funniest part was our new director of Sales and Marketing at the time. We got a 2am priority 1 emergency call - "EMAIL IS NOT WORKING!!!". Well, what happened was that we deployed a new version of the antispam system so his "crotch area" stopped being stimulated every 10 minutes by the CrackBerry in his pocket or so so he panicked. As a result I had to adjust for him personally the SpamAssassin pass score down to under 5 to keep the stimulation levels.
All I can say - some people need a life.