hi,
my 5mo has been doing this for the past couple weeks too! used to feed only once at night, no dreamfeed. i think it's developmental - he's been learning to roll. since your lo is around the same age i'm guessing it's developmental too. even subtle developments, like learning to hold their hands together or switch objects from hand to hand, are huge for them.
don't know the answer, i've just been trying to do pu/pd and pray for the best!