Haha... it’s more about their character. You will probably see it soon.
Glad to hear your wife is recovering well.
Not sure if this is helpful but i was told we need to help baby to differentiate between day and night. One way to do this is to put them in long pants at night and diaper/lampin/shorts (basically nothing that covers the whole leg) during the day. Of course if you are worried that they might feel cold u can cover them with a light cloth/blanket during the day.
It worked for my kids and hope it’ll work for you too.