Is it worth it to sleep in an extra hour before work to feel refreshed instead of coming in early?

I’m just starting at my job and after two weeks I realized they don’t really care when people show up as long as you get your 40 hours in, can even work from home if you feel bad. I had been coming in at 9am to look sharp so they dont fire me, but then lately I started hitting snooze for an hour and coming at 10am like my coworkers do. Do you think my boss will see me as lazy or fire me? I just really need this job but I don’t regret driving to work safe and unsleepy