Snap, crackle and pop

There must be some major humidity changes going on in the house. Last night as I was drifting to sleep, a huge snap awakened me, followed by stuff rolling around. My curiousity got the best of me, so I got up and walked around until I saw what happened: A big beam snapped down the middle which freed up one of the pegs which concealed the lag bolt holding the beam in place. The peg was what was rolling around.

A few hours later, at four in the morning, another enormous crack--almost like thunder--and apparently another beam formed another new crack.

The house has been very humid for most of the winter. Many people report that their new houses were moist the first winter. Now, however, I think things are drying out. The beams are cracking. Gaps are appearing where things were once tight. And you can sit awake at night listening to the wood move.