Just found this:

http://www.changiairport.com/at-chan...ces/rest-areas

I be coming from terminal1 off the plane AND again i have to be on terminal 1 to catch my next flight 5 hours later. This means i have to remain at terminal 1 for 5 hours since it looks like there are shops... lots of things to do.. Because if i go downstairs i end up all sorts of security imigration check up and so on... confusing. Maybe best i remain at terminal 1 level.