Email curfew in IT?

Information Technology is on a 24-7 kind of schedule to meet the demands of IT managers and their superiors.  Would the idea of an email curfew, a period of time when work-related email is frowned upon, ever be a possibility for IT consultants?

IT staffing firms may soon be seeing the IT contractors they work with finding ways to adapt to such a practice at their IT jobs.  The practice is already finding traction at a Philadelphia company and all over the internet as various news sources and bloggers debate how effective the method is at facilitating work-life balance or hindering effective business.  It seems like only a matter of time before technical recruiters find themselves searching not only for pristine resumes, but also for IT professionals who can adhere to an email curfew and still get all their work done quickly.

AVID Technical Resources About AVID Technical Resources
AVID (Applications, Voice, Internet, Data) Technical Resources is a leading Information Technology recruiting company. Specializing in placing contract and permanent personnel in both Infrastructure Support and Applications Development positions, AVID has a national presence supporting clients ranging from small businesses to Fortune 100 companies. Headquartered in Boston, MA, AVID has achieved tremendous growth since the firm's inception in 2003. This has triggered numerous national awards and recognition, such as being named to Inc. 500 Magazine's list of 5,000 Fastest Growing Privately-held Companies in the US in 2010, 2011 and 2013. Additionally, the firm boasts of having more than 100 five-star reviews on Google from clients and candidates who rave about their experience and interaction with the firm's recruiters.