Does changing your body clock decrease your life span?

When i say body clock... the sessions to go to bed and wake up

i.e. bed:10:30pm wake up:7:30am

then bed: 1:00am wake up:9:00am



is it bad for you?
Does changing your body clock decrease your life span?
Only bad for the society... because you aren't synchronised with many others who may need to contact you at a certain time to get a job done.



Though the above statement could be irrelevant if you deal with world time.
Does changing your body clock decrease your life span?
300 char lim sucks. Watch out 4 continental roster shift patterns, especially ones with quick changes, i.e. back at wrk in less than 10hrs. (decent firms pay penalty payments 4 this). Permanent jet lag is the result. New Scientist said my rosters were worst possible.

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