I ask because our room is right next to J's, his head hits the matress about 10-12 feet from where mine does, we leave the doors open so I can hear everything. The monitor died last night and I noticed that I could still hear him and get him this morning. I actually slept better because I didn't wake up every time the space heater turned on in his room. Thoughts? Am I going to miss something important? I feel confident in the fact that I'll hear him, I haven't slept a whole night since he was born, but I feel....wrong...? not using one.