Strange Spring type noises

The house has been abnormally quiet through the fall. But just before Christmas I experienced a strange situation. With all the activities that go with the Christmas rush I just hadn't had time to record it here. Anyway, my wife has a part-time job that, on rare occasion, requires her to open a large store rather early. She had fretted all day about getting up so early to do the opening. So we went to bed early and the older of our dogs went to his bed next to the heat register and laid down. The younger dog jumped up on the bed and it looked like she was following something overhead, twisting her head like she was following something that we certainly couldn't see. Then she jumped from the bed and ran pell- mell down the hall. She was gone a few minutes and I heard her yipe, so I got up to see what the problem was. But before I much more than got up she came running back into the bedroom and back upon the bed where the whole series of events repeated. This occurred several times and my wife in desperation got up and went downstairs intending to sleep on the recliner. This behavior on the part of our younger dog is very uncharacteristic. Usually she goes to bed and sleeps until we awaken her in the morning. I was the one stuck with trying to figure out what her problem was. I finally threw the top blanket over her and tried to calm her down. She about shook me apart. Thats scared shaking not cold. About 3 am she settled down and I was able to turn off the lights and try to sleep. But that was not the end of the weirdness. I bagan to hear noises about the house, not common noises like we are use to, but strange noises too indiscrip to pinpoint. It was not scarey, but it was irritating; then very low I thought I could hear crickets. Thought I was hearing things; it is cold this time of year in Ohio and crickets just don't sound off this time of year. The sounds grew louder and instead of crickets I realized I was hearing a springtime chorus of crickets, peepers, and other insects like one hears in early spring near small bodies of water. These sounds, when I was a child, were very soothing and would lull you to sleep, but not when you couldn't figure where they were coming from on a cold day in December. I got up and checked around, I could not detect a source for the noise. I cracked open a window but the sound was inside not outside. I finally gave it up and a few minutes til 4 I let the sounds put me asleep. I have no idea how long they lasted but I didn't hear them when I got up the next morning. The dog was fine the next morning and her older counterpart had gone to sleep and never was bothered by any of it. When my wife returned from her job I asked her if she heard anything unusual during the night and she replied "No, Why?"What was bothering the younger dog so? Where on eaerth did springtime sounds originate from? Why was all of it just upstairs in the front portion of the house? Might be totally logical explainations for all of it. But I haven't found them yet.