4 weeks in and I'm losing it with the sleep deprivation

My son won't sleep longer than 90 minutes at a time and it's destroying me. My wife and I have tried everything - white noise, swaddling, the bassinet right next to the bed. I'm running on like 3-4 hours of broken sleep a night and honestly I'm starting to hallucinate a little bit. Does this get better? When does a newborn actually sleep for longer stretches? I feel like I'm failing because I can't just power through like I expected.