Need advice

We arrived home two nights ago after a month-long NICU stay, and I've been sleeping through the night, making me feel like I'm not pulling my weight in helping my husband care for our baby, when it comes to pumping, as I've only pumped five times in the past 48 hours, while my husband has been handling night shifts and drove five hours from Denver; I'm wondering how others manage to wake up for nighttime feedings and changes, as I'm struggling to wake up to alarms, and I've asked my husband to wake me, but he won't, leaving me feeling guilty for his exhaustion despite sleeping through the night for two nights in a row.