We took our monitors for nap time. I would put DD to bed (with room doors locked). Then I would go sit on the balcony with a book. The monitor worked just fine. Having it kept me from feeling like I had to keep opening the door to check on DD. The sliding doors and outside noise can be just enough of a change in environement to arouse my little one. I have traveled in the past without the moniter but was glad that I packed it this last trip.