Our kids sleep with us and we have a 1bhk apartment. How do I spend quality time with my wife?

If your relatives are around you can have a kids stay at their home for a few hours. Or you can go late to office, and since kids would have gone to school you can spend time with your wife. There are daycares that babysit kids on the basis of hours. So, once in a while you can leave the kids at the daycare for a few hours. You can also make the kids sleep in the room and yourselves sleep in the hall or visa-versa.