Sleep tips for mom and partner

FTM, Baby is 6 days old. I had trouble getting milk in and so I’m trying to be really on top of every 2 hours feeding during the day and 3 hrs at night. Husband is awesome and does mostly everything around the house, but I’m not sure how to figure out our sleep routine. I’m so tired—probably running off of 2 hrs of sleep today — and I’m in my nap time, but I can’t actually fall asleep or nap. How do you fall asleep so quickly when you know you’re going to have to wake so soon? Sleep is making ms consider switching to formula if I can’t figure out a routine. any help is appreciated