How does thoreau describe his sensations and thoughts as he lies in jail during the night?

In "Civil Disobedience," Thoreau explains that he is put in jail because he is against war and slavery. Thus, he feels at peace because he is taking action for the principles that he believes in. Besides, he thinks that slaves must face worse things than him, even when he is in jail. As a result, he expects that his actions will inspire others to fight for their beliefs.