This is my first time through SIN. I'll be arriving on UA 803 at 23:59 and leaving the next morning on SQ 192 at 8:05. I am considering the transit hotel for 7 or 8 hours and was wondering if I should book the T1 or T2 location, or are they close enough that it doesn't matter?

Also, this trip is rather close in so only budget rooms are available. Are these alright, or would I be better off heading into Singapore and taking a later flight to PEN?

Lastly, is the airport open all night? I could stay on East Coast time and wander around as a final option.