habit stacking self care & studying in med school

I used to do this thing when I was studying during college that made me so effective at studying that I completely forgot. And I remember there's an official term for it. And it's called habit stacking. So basically, as you're doing one thing, you build a habit by also doing it with another thing at the same time. And so a lot of people, for example, when they're in medical school, they'll habit stack on key walking on a walking pad or treadmill or whatever, trying to study, right? For me, though, because I didn't have a walking pad and also I still don't have a walking pad and don't know if I have the capability of doing walking pad. I would do instead all my self care while studying. But particularly, I would do stuff that like the longer it marinated, the better it would be for me. So I would do like hair masks, face masks, or under eye patch things. But I never found one that could actually adhere to my face because it's like every time I would lean over to actually write something down or look at my textbook or something, they would all fall off of me. And so that was too much of a hassle. But the reason why I like putting stuff in my hair as well as on my face is because it makes it a little bit harder and more cumbersome to go lay down because my issue with studying is that every room I have had where I study, my bed is too close to the desk just because of the space I have, right? So if I have stuff in my hair and on my face, it would be very hard for me to go lay down and thus be unproductive. So I kind of have to sit at my desk where I'm more inclined to work if any of that makes sense. But if you have any under eye patch or face mask that actually adhere to your face, particularly the under eye patch, please let me know because I would like to get some.