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To develop energy we need initiative, persistence and exertion:
SN46.51:8.1: And what fuels the arising of the awakening factor of energy, or, when it has arisen, fully develops it? There are the elements of initiative, persistence, and exertion.
If you're exhausted from exertion, then lying down and waiting for energy can give your body and mind a chance to recharge and retake the initiative. But if you haven't exerted yourself, then lying down won't restore any energy. Fortunately, te Buddha follows with more advice. Indeed, the Buddha recommends various ways of fostering energy in the Nodding Off sutta that you quote.
For example, walking for a time does take initiative, persistence, and exertion. In particular, we have:
AN7.61:8.1: But what if that doesnβt work? Then walk mindfully, concentrating on the perception of continuity, your faculties directed inwards and your mind not scattered outside.
There are several ways to "concentrate on the perception of continuity". A simple one is to count your breaths. If that is too dull and makes you sleepy, listen to a sutta repeatedly (i.e., for continuity) as you walk and see if you can predict what will be spoken next.
I personally tend towards couch potato, so walking meditation has been very helpful and allowed me to develop energy. Perhaps it may work for you as well.
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You should do walking meditation to counter your depression. Walk around focusing on your meditation object of choice.
I strongly recommend recollecting on your generosity (caganusati) and recollection of virtue (silanusati.)
When practicing caganusati reflect on previous generous deeds and think, "How nice it is that I practice generosity in a world tainted by greed."
When practicing silanusati reflect on your observance of the five precepts and think, "By keeping the five precepts perfectly, I have real worth as a human being."
Alternatively, you can recollect on the Buddha. You can do this by thinking "Buddho, buddho, buddho..." over and over again or you can think, "How wonderful the Lord Buddha was: a person that completely shared his teachings with no expectations. He is completely free of ulterior motives, free from defilements, and has ocean-like compassion."
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Present situation is the result of past causes, so it would be interesting to see what led you to that constant state of fatigue in the first place.