Waking right away

My baby has been waking up more at night than he was, but even so, at his "worst", he'd usually sleep 2-3 hours. Lately when I go to lay him down for bed at the beginning of the night,, he either wakes immediately or like 5 mins later. Last night it took 3 times. He's never been like this.

What gives?

Yes, yes. I know he should be "drowsy but awake", but that ain't how we roll.