Night shifts

Hello, I currently work days anywhere from 3-7hours per day. My son goes to before school care on the days I work as I start at 7.30am. Working in Aged care Im not on the best pay, but I love my job. I am thinking about doing a.couple of night shifts a week on top of my day work. The night shifts are 10pm-6am. I figure I could do them when I have the following day off or have a small shift the next day. Im purely wanting to do this for extra money. My husband works long hours and although we never go without, we never seem to be able to save either. We have always rented and want to be able to save for a deposit to buy our own home. My question is, does anyone on here alternate between day/night shifts? Does it mess up your body clock? Are you constantly exhausted? Also would just like to say I spend all of my time with my son and he never misses out on family time. He goes to bed before 10pm and doesnt wake up during the night so he wouldnt even know I am gone :-)
Thanks in advance!