Days and nights mixed up

Anyone else’s baby still have day and night mixed up? My baby is coming up to 4 weeks and does solid long naps during the day but nighttime is horrible barely more than an hour before she’s up again and it’s like all her wind and reflux saves itself up to strike at night so I’m lucky to get a total of 3 hours sleep at night at the moment.

I have a noisy toddler around during the day and follow all the tips on keeping it noisy and bright during the day and dark and calm at night but haven’t noticed any improvement. It’s a real strain as I can’t nap during the day as have the toddler to look after.

Help!