How old do puppies have to be to spend the night away from their mother?

Just the night, about 8 hours. Our puppies are 5 weeks old (English Pointers, a medium sized breed) now and have been staying with their momma in a heated garage since they were born. I really want to let the momma dog sleep in the yard (unlike my German Shepherd, she has never been a house dog) because she is pooping huge mounds in the garage and it reeks horribly all throughout the house. Will the puppies be alright if they're away from their momma for 8 hours? They've been eating a "cereal" mix of dry puppy food mixed with milk and slightly heated so I could leave that for them when I go to bed if you think that would help.