What happened to sleep?

During my pregnancy I couldn't sleep because... well, everything. I brought baby home and for the first week everything was great. I set alarms to make sure he was eating as often as necessary and we both got great sleep. Now he's almost 2 weeks old and cries any time I put him down but ONLY at night. During the day he'll lay there peacefully or even fall asleep. I get that he has night and day confused but NOTHING I try does any difference. I know he won't just magically sleep through the night but any tips for fixing night/day confusion?