Ugh, my daughter's a wreck - totally OT all day long - 30 min naps 3 x day - multiple NW (this is new, but not surprising, given the nap problems). From 2-3 mos she never went to be before 11:30pm or 1:30am, even! We fixed that, whew. Got her a decent bedtime but she still woke up 45 min after bed, then would be up, then would wake up again an hour after going down. Last night woke up an hour after bed (improvement!), but then was up every 2hrs.
Be glad your LO is getting good daytime sleep!