What are the main differences between the recuperation and circadian theories?

Recuperation theory, states that the bodies homeostasis stage is thrown out of whack when we are awake. Therefore we sleep to restore energy, (even though this is not proven) Or we sleep to restore homeostasis. Circadian theory suggests that we sleep, because of harm in the dark. We as humans do not require sleep physiologically, but sleep to fend off predators or harm. Circadian theory suggests that nothing will happen to the body if we do not sleep, but suggests its a good idea to reserve energy and to keep from harming ourselves in the dark.