My parents love loose tea and order their tea from Upton Tea. They love it, and you can get sample packs and all sorts of things. Their customer service is also really great (My mom placed two orders in one day shipping to the same place and Upton tea called to ask if my mom wanted them packaged together or separately either that day or the next).

I really like jasmine teas or spiced (ginger, etc) teas. I also really like celestial seasonings Bengal Spice and Tension Tamer.

I always wondered if some of the reasons drinking tea before bed helps is because we set up a routine to help us relax, so the effect is partially from the tea and partially from the routine.