The best way to reset your inner clock is to go to bed and sleep until you wake up. I know its hard with a family/life/work and stuff but it is really the only thing that will cure your sleep deprivation. I've been in the Coast Guard for over 13 years now (boat driver here) working at a search and rescue station is just like working at a fire house. We typically work and train all day then end up pulling the all night SAR case towing a boat in all night and into the morning. A few days of that and you are toast. The best thing to do is try and get atleast 8 hours of totally uninterupted rest/sleep. Easy to say right? LOL but seriously it's the best way. My advice is get that 8 hours and go kill something will ya!?!? LOL