Sorry I don't have any advice but just wanted to say that bubs will sort out the day & night difference on their own. My DS was up all night in the early weeks but slept all day!! He turned his body clock around eventually.
That being said I've tried not wrapping DS in these hot days but he won't have a bar of it!! Refuses to settle until I've bundled him up - don't know how he can sleep like that
Hope someone comes on who can answer your original question.