Baby slept for 5 hour stretches for the first time last night.

After the first I fed him from one breast and then accidentally fell back asleep before pumping the unused one.

Woke up 4 hours later to an extremely painful and engorged breast. I just pumped 4 ounces off of it but it is still very hard at the top. Any tips to resolve this?

I’ll be setting alarms to pump more frequently while he sleeps through the night but looking for tips to help with the current situation. Thank you!