That depends entirely on what a 'garge' is.
If you are asking whether or not they can sleep in a garage then that would depend on the environment within. Guinea pigs should be kept in a relatively warm (no colder than 15 degrees Celsius) environment . The temperature should not get too hot, though― too much more than 25°C and your poor little cavy runs the risk of heat exhaustion. He's also going to need some soft bedding (think wood chips).
If the garage is climate-controlled, this should not be a problem, but most unfinished garages are too hot or too cold for a guinea pig to live comfortably in.
If you wouldn't be comfortable sleeping in the garage, your guinea pig won't be, either. Better to keep him in a proper pen inside the house.
Never keep a guinea pig in a garage because car fumes, no matter how little will make it ill. Anyway, how would you like to sleep in the garage?
play till they sleep
Yes.
yes
They sleep at night.
yes
They are not strictly nocturnal or diurnal, but are more active in the daytime.
Mostly they either eat and sleep.
Yes.
they sleep and eat all day
i think they do. my guinea pigs make noise when im sleeping but sometimes they dont so yes they do sleep
Yes, they do. They sleep in the morning,but you might not see them. & also, they sleep with their eyes closed.