The most tired cast in the history of film?
The only person who believes Alice right off the bat is of course Dan. But he falls asleep at the wheel and gets killed. Why would he have been so tired that he was falling asleep? He wasn't sleep-deprived, he had just found out from Alice that Freddy was back and he hadn't experienced any new dreams himself.
Same thing with Yvonne, Mark, and Greta. Greta doesn't buy into Alice's story but is so tired she falls asleep at the dinner table? Who does that? Mark sorta believes but he's also so tired that he randomly falls asleep the first time. Yvonne actively believes Alice is insane but of course, she's also sleep-deprived and falls asleep for some reason.
Nobody outside of Alice had any reason to be tired enough to be constantly falling asleep.