Need a moan

My baby girl is nearly 4 months old and she's slept through the night only 1 time. At the moment it's so hard. I spend most of the night awake as she's constantly waking up. It's 3:50am and I've been awake since 12:30am. It's just so draining. Husband sleeps in the spare room for now as I couldn't put up with the snoring also (incredibly loud) . My son was such a good sleeper compared to her. So hard to carry on the day after night's like this with the 2 of them