Sorry I do not know the up to date room rates. However, in 2006 they were starting at B2000 for 4 hours. I doubt if they have gone down since then. Assuming you have time to go landside, and I realise that may not be possible, the Novotel is a reasonable option, especially as they now offer what they call 24-Hour Flexi, so you can stay for a full 24 hours from when you check-in, whatever time of day or night you start. http://www.accorhotels.com/gb/hotel-...rt/index.shtml
Also from 6 am to midnight you can go down to the train station in the basement of the airport, follow signs to the hotel and walk underground on the flat, with ramps for luggage trolleys, instead of taking a mini bus, although the mini buses are still running if you don't want a 10 minute walk or have too much luggage.