This is classic, very, very common. Especially for meditators, and especially for people who are idealistic. They start to get sick. They don't recognize it's a sickness. Then all of a sudden, they think, "What is it? What is that hindrance? I must be having sloth and torpor. I must be. I can't possibly be doing anything else. I'm terrible, I'm having sloth and torpor."
I was with one meditator many years ago, who reckoned they had sloth and torpor really bad. They really felt it was terrible. They were a lousy meditator. An hour later, they were in a hospital on a drip, after they had fainted. They were dehydrated. They had food poisoning. They stayed in the hospital for two days, but before they recognized that they were actually sick, they thought they had sloth and torpor really, really, bad.
We can be more in tune on the physical level. Absolutely. Like this says, "Could it be that my body awareness was not strong enough?" Yes. Can we be more aware of our body? Whether it is sick or healthy. Can we be more allowing for the possibility that it might be sick? Just to allow for the possibility takes away this kind of "beating ourselves up" that we might be doing lousy practice today, "I'm a crummy meditator", "I'm full of sloth and torpor", or whatever else. Just to allow the possibility that, "Oh, maybe today I'm not feeling well", "Maybe today I have a bug", "Maybe that's why it feels so lousy today".
So it is helpful to get more in tune with your body, so that sometimes you realize, "No, no, it's not sloth and torpor. No, no, there's not a mental hindrance. It's just I'm feeling sick, I'm tired, I'm worn out and I have to sleep."