I thought of one more thing. Because sloth and torpor is my biggest challenge too, I have a 'system' in place whereby I time the 'main meditation sit' for the day to be at a time when I know that I will be as alert as possible. For me, that is in the morning, before
breakfast, but after
a strong caffeinated beverage...(everything has it's proper use, so long as it's allowable
). One day I aspire to be able to do it even at night, even without the caffeine...but in the meantime,
part of my 'creating the right conditions for practice' is doing (the main sit) in the morning,
eating (the mind is sharper when the stomach is empty of food). Finding your own 'best time of day for alertness' (and if need be the aid of a cup of tea or coffee) might help you also. Just a thought...