What does Buddhism teach on cultivating energy for those who are drowsy? This is rather a personal question.

Sometimes, I am a very depressed individual, and besides other things, I'm struggling with a lack of energy.

It happens that I sleep for 10 or more hours. Usually, after waking up, I'm not actually awake, but just keep on dreaming, being half-asleep. It's very hard to get up: the urge for sleep and dreaming is so strong, while consciousness is not awakened yet... In sleep, often there are nightmares about the conflicts and rejection, although I usually forget everything.

Also, sometimes I feel drowsy during the day. It's very hard for me to maintain mindfulness, often I keep on doing a dull, pointless activity, probably again because I'm deprived of energy.

In AN 7.58 Buddha says:


  But if by doing this you don't shake off your drowsiness, then — reclining on your right side — take up the lion's posture, one foot placed on top of the other, mindful, alert, with your mind set on getting up. As soon as you wake up, get up quickly, with the thought, 'I won't stay indulging in the pleasure of lying down, the pleasure of reclining, the pleasure of drowsiness.' That is how you should train yourself.


I really try to train myself like that, but forget about everything in the morning and just "stay indulging in the pleasure of lying down."

So, what would you recommend me to be more alert and mindful during the day, to sleep less and to get up more quickly?
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.