does it really matter why?

She wanted to.

I specifically remember one instance while working retail when my feet hurt so bad I thought I was going to pass out. I was wearing decent shoes too. Sometimes standing for a long period of time will just do you in. I'm assuming that's what OP means.

I passed out while serving in church when I was younger due to being too warm, and the women on my moms side of the family tend to pass out when they're pregnant...so it really could be anything

Meh

You can do better. I have faith in you.

He was about to pass out. Not go to sleep.

Passing out is just accidental sleeping.

Fun fact the longest time someone has stayed awake willingly without medication or stimulants was a 16 year old born in 1947. 11days 24min legendary.

Another fun fact around 10 days without sleep can be deadly. The brain starts shutting down important functions.

Yeah because OP will have enough time so research a health issue no one knows about at their job? Especially with that controlling of a boss? Good luck.

Because if corporate or the owner happens to walk in and see that, the supervisor/manager would in trouble for allowing it and "wasting time" I know from personal experience at a fast food restaurant

It's the same at my work. Leaning makes you look slouchy and casual, and isn't professional You should be standing up straight and presentable, looking ready to greet guests or whatever it is you do. I'm not saying I agree with it, but that's the way it was. There's always people complaining that their feet hurt and they're gonna pass out and wah wah wah....I've been in situations where I genuinely do feel like I'm gonna pass out and I've quickly gone out back to get a drink and compose myself. But there are a lot of people who just whine as well, even though it's kinda part of the job.

or Bill Lumbergh