Circuit breaker trips in middle of night?

recently had house built in 1930 totally rewired, new 200 amp panel, house brought up to local city electrical codes, new receps, new romex to all outlets and fixtures. new panel has regular breakers except for 3 special "quick trip" breakers required by code in master bedroom and office area. One of the three breakers trips about once a week in the middle of the night, shutting off our receps. in master bedroom and office. Only things that are plugged into the receps and left running all night are the Direct TV DVR/reciever, computer and two clocks.