I don't know how my night was.
In my area, when you wake up from sleep, people usually like to ask you how was your night implying how was your sleep obviously and most of the time we say fine.
But just this morning, went I went out, somebody asked me how was my night and I replied that, I don't know how my night was because I was sleeping. Hehehehehe!!!
I think the real thing people should say is how was your sleep and not how was your night.