Thailand - Bangkok night markets

Sorry if this has been asked, but I am on a Kobo Vox and one of it's quirks is I cannot search FT, my question is this: if my flight lands at BKK at 9:30pm on Tues will I have time to hit any markets for final souvenirs/xmas gifts or should I finish any shopping in Chiang Rai's somewhat disappointing market? (I don't know why I thought waiting in Chiang Mai was a good idea?!) Unfortunately my flight out the next day is at 12:30, so that cuts out the next morning for shopping (even if I did want skip my TG F massage, I doubt the shops would be open in time).

Thanks for any help, and again apologies for duplication!

You should be fine for late market shopping. Huay Kwang market stays open till the early morning. Plenty of stalls scattered around the Soi's almost directly outside the Huay Kwang subway ( no skytrain ) If its your last night its an easy enough place to combine the evening with meal/drink/shopping.
Had it been the weekend i would have also added Talad Rot Fai.
Not been to Ratchada market but I believe that is also an option.

http://shopping-in-my-bangkok.blogspot.com/2011/03/siam-paradise-night-bazar.html

I haven't been but have driven by many times, easy to get to via the BTS (skytrain); I think many vendors moved here from Suan Lum (Lumpini).

Awesome! Thanks, makes things quite a bit easier! :)