(22 weeks) nausea questions!

So this has happened twice now and I want to know if anyone else has experienced this?

Two separate nights maybe 2 weeks apart I have woken up in the middle of the night feeling SO SICK. Like can’t get out of bed nausea, shivers, headache, almost throwing up. This lasted 1-2 hours each time.

Both times I just tried to sleep through it and eventually woke up in the morning completely fine.

Is this possibly due to eating greasy food that day? Constipation? Just “morning sickness” hitting in the middle of the night?

Any ideas? or has this happened to anyone else?! I feel crazy now that it’s happened twice.