Last night it took three hours to put my son to sleep. He fought us and woke up screaming 5 minutes…

Last night it took three hours to put my son to sleep. He fought us and woke up screaming 5 minutes after he'd fall asleep several times.. the night before it took an hour and a half. He's fine during the day and he doesn't have a fever and doesn't seem to be teething.

Is this sleep regression or something else?? What can I do?