7.30am Scoot flight: Can I clear Immigration the night before flying off from Changi Airport?

Family of 4, each with own medium-sized luggage, so we definitely can't fit into 1 cab. I don't wanna spend money on 2 cabs in the early hours, which would be expensive, so I thought of taking direct bus from my home at ard 10pm. Can I check-in my luggages & enter Immigration the night before (say, ard 11pm+), so that we can rest at the transit area while waiting for our 7.30am flight?