Why is Cole’s sleep troubled after he drags the log to shore?

When Cole finds a huge washed-up pole, he decides to make a totem pole carving out of it. However, the log brings the possibility of making a canoe for escape, and Cole has trouble sleeping as well as skips his morning soak in the freezing pond as he contemplates this possibility with anger in his heart for the first time since Edwin and Garvey departed.

why does cole have trouble sleeping the first night n the island?