You should remember to remove the cats if you use the trap for its original purpose. The first time you bring the cats aboard they will find it for you. Leave them alone and they will finally come out. Assign a person to watch each cat and start the engine. It helps to have a rug on the floor so they have starting traction for their flight.
Cats seem to sleep all the time.
Cats sleep when you are awake. They get up when you go to bed. A boat is a fairly confined space so many times they like to hold dancing practice on your bed just as you are dozing off. Many marinas have resident harborcats. These cats have their established territory and your boat will be in the middle of it.