I knew about the pain meds in limited quantities, so I brought plenty, but I did not know about the lack of sleep aids. So I've got Nyquil on the way for the next time I get ill. They have something just like Dayquil/Nyquil here, but instead of a sleep aid for night, they just add caffeine for daytime. NOT the same thing! lol
It depends what and where you buy - if you are talking about the drugs you find on the supermarket shelves, then yes, they just have caffeine added to the daytime tablets. This is because products with drowsy ingredients are not licenced for sale in supermarkets and so in order to buy something closer to Dayquil/Nyquil, you need to go to a pharmacy and ask for it from behind the counter. There are plenty of products with sleeping aids in them, but you can only buy them from a pharmacy.
I think the closest products you'll find to Dayquil/Nyquil are Day Nurse and Night Nurse - in terms of ingredients, they are almost the same:
Dayquil: Acetaminophen, Dextromethorphan and Phenylephrine.
Day Nurse: Paracetamol, Pholcodine and Psuedoephedrine
(In general, pholcodine is a slightly more effective cough suppressant than dextromethorphan and Dayquil used to contain psuedoephedrine until regulations of its sale were tightened in the US and it was replaced with phenylephrine)
Nyquil: Acetaminophen, Dextromethorphan and Doxylamine Succinate
Night Nurse: Paracetamol, Dextromethorphan, and Promethazine Hydrochloride
(Only difference is the type of drowsy antihistamine used in the product)