How much sleep are you new mums getting?

Hi lovely ladies, my little one is 12 weeks old and he is actually a great sleeper. (Although he hates to nap during the day) He has 2 night feeds 11pm and 3:30 am and wakes up around 7 am however i find myself only getting 5 hours of sleep a night at its best.

I struggle to fall back asleep after his 3 am feed and usually fall back asleep at 5:30 am and he wakes up at 7.

How much sleep do you ladies get per night? Also does anyone else struggle to sleep even when the little one is fast asleep? How do mums survive on such little sleep lol!