Sleeping at Changi airport

Hi all,

I have a flight arriving after midnight soon and I will need to clear customs to collect my baggage but then I want to spend the rest of the night in the airport. The next day I will put my bags in a locker and cruise around the city until my flight at 11.30pm.

So does anyone know if there are any good places to sleep on landslide at changi? I don't have much cash so I don't want to pay for accommodation. Anyone got any suggestions?