Nope, perfectly normal night bird behaviour!
My Conure mumblings, clicks and grumbles to himself in his sleep all the time. When he hears a mysterious noise he'll wake up then grumble himself back to sleep.
The cockatiel is either a heavy sleeper or you just can't hear his noises. Cockatoo's are waaaaay louder than Cockatiel's in general so sleeping wouldn't change that.
It is possible that the new location and noises are waking the cockatoo up more often. As he gets used to the new night noises he may eventually quieten down again at night.
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