What causes forgetting combos as a lead?

Obvious reasons

Anxiety, I stopped drinking coffee or energy drinks to get my attention up. The club is too much of an overstimulation anyway.

For me if I only have had less than 5 hours of long night sleep, I see myself repeating basic patterns

The very first dehydration signal, usually happens the first 30 minutes or hour. After spending a whole day in the office to go out and dancing, we all need an hour or so to warm up and hydrate, I do not. But then I'm having too much fun to take a break and drink. Doesn't help when club is humid.

Other causes - Follows feel stiff. I agree it's ultimately up to the lead 99% of the time but some follows even when they're seasoned, just have quite stiff form or arms that I'm afraid to try anything different. When I do, it would feel like I'm trying to show off, when I actually don't intend to. I think the way to better this is to extremely slow down, almost like a sensual salsa. Thoughts?

On some nights, certain accents stick. Like that simple turn for the follow and elbow fold. I'll see myself doing it over and over again in the event. On better nights, I'd not only have this but remember variations, exits and entries to make it way nicer and neater. Some nights, I just don't.

Maybe because we learned this at a later age? Lots of my group just got into it late 20s mid 30s.