Contractions/BH only at night?

Samantha • First time mommy due with baby #1 September 2017

Hi ladies. I'm a FTM currently at 37w6d. Last night I swear I was having contractions in my sleep, I just remember waking up multiple times moaning in pain and feeling nauseous. Now that I'm up and getting ready for work I don't feel anything. Is it likely that I was having BH that went away or imaging? They felt SO REAL and seemed to go on for over an hour...