Noise at 6 am. I’m wondering whether I am the only one. Every Apartment I go to has a low frequency noise at 5 or 6 am that wakes me up, and I can’t get back to sleep. It is not there during the day or late at night. This has only happened in Italy, never any where else. Does any one have an idea what it might be? Is it the pump for the caldaia (heater), some electrical thing, neighbor’s washing machine. It is not my nerves because I go to sleep in complete calm. Please help me find an apartment that does not have this attribute.