I recently had our solar panels serviced, and Marquis, the man who serviced them, told me to check my house for "energy vampires."
I didn't know exactly what an energy vampire was, so he explained that an energy vampire is a piece of equipment that is secretly draining power, even when it's turned off.
This reminded me of a line in the Fourteen Mindfulness trainings (the 14th) that says, "we are determined to ... learn ways to preserve and channel our vital energies (sexual, breath, spirit) for the realization of our bodhisattva ideal.
Thich Nhat Hanh expands upon this in a commentary on the 14th training:
In the religious and medical traditions of Asia, the human person was said to have three sources of energy: sexual, breath, and spirit. Sexual energy is what you spend during sexual intercourse. Breath energy is the kind of energy you spend when you talk too much and breathe too little. Spirit energy is energy that you spend when you worry too much and do not sleep well…