Currently going through this and my daughter will be 8 weeks on Thursday. It started about 2 weeks ago and I've tried keeping her up during the day but it just makes her irritable and then she ends up fighting her sleep all day and then crying all night until about 4ish am until she finally passes out from exhaustion so I don't try to keep her up during the day anymore unless she's very alert and looking around. I have found that keeping music on all night helps her sleep and I've let her sleep in the swing the last few days since she doesn't wake as much when she's constantly rocking. I'm not sure what else to try but it's getting frustrating to lose so much sleep

My little girl was doing that at about 6 weeks too. She was sleeping all day and not at all at night. She finally got out of it after a couple weeks on her own, but what helped her sleep at night a tiny bit was during the day we would let her sleep 2 hours then keep her up for no less then an hour and keep the pattern going until it was night time. Good luck it will get better!

Try swaddles! We did them in the beginning but he hated them and always broke out and had to have his arms out. So we just gave up. Recently he has had the spastic flailing arms in his sleep and wakes him up so I've been swaddling him again and he's sleeping 3 to 4 hours at night!
During the day, I try to keep him busy... when he's awake, I'll put him on the play mat for a little bit... or just play with him.. sometimes we just dance around the house :) lol as soon as I notice he's getting tired.. I put him in the swing for a nap.

My 7 wo went through something similar a couple weeks ago. I got a night light and we started using white noise at night about an hour before bed time to relax him and all during the night. He wakes to nurse, the first time is after about 5 hours of sleep. LO likes the sound of wind and the sound of radio static. Bassinet is in our room and DH and I can sleep through the white noise, but I still wake to lo's rousing from sleep.
I'm reading the Happiest baby guide to great sleep, took the white noise advice from there

My baby is taking short naps during the day but luckily still sleeping at night as long as I’m right next to him so I don’t get much sleep either ?
But we do sleep with a dim light on at night for him and it seems to help quite a bit.

also she HATES the dark. She will cry as soon as I turn the lights off but calms when I turn them back on.