DD was three months. She was home for just over two months and after not sleeping for what felt like 90% of the time, we droped her at my mom's house and went to catch a movie and had a lovely romatic dinner and SLEPT THROUGH!!!!!
we were up before daybreak, just eager as hell to go pick her up. But we had the most glorious night's sleep.

Go for it, your mom raised you, and surely you can trust her with your most precious bundle for one night

ENJOY the sleep!!!!