You probably have co-workers who send emails at odd times to show that they're working at all hours. And you likely have colleagues who stay late at the office, not because they have to, but because they want to look like they're working extra hard.
While these tactics may work for a time, they're not going to sustain you in your career. If you've got a boss or job that truly demands this level of attention, then you may be out of luck. But otherwise, you need to tread carefully.