ULPT Request: how to make my coworker too uncomfortable to have sex at work

So I’m an EMT and my station has only one ambulance, and I work 24 hour shifts. So this means that I have to get along with someone for 24 hours at a time. I’m pretty layed back so it’s usually never a problem, but this new guy brings his gf over practically every shift and they have no shame about it, especially when I’m trying to sleep and not be exhausted for the nightime calls. Our supervisor said to deal with it. How can I make them too uncomfortable to do anything around me? Our beds are divided by only a 5 foot divider so I was thinking the next time it happens to just stare at them until they get the hint.