Need help - want to night-wean

My 19 month sleeps with us and has always nursed throughout the night - but I am not sure if it is the right thing for us now - and I have no idea if I should somehow stop the night nursing - and if so how. (I really do not want to fully wean - just the night feedings). I work full time - and I am just exhausted - always. I feel like I am awoken at least 4 or 5 times every night.

Also - I feel like nursing is interfering with her eating. She would much rather nurse than eat - she usually...

Need help - want to night-wean