I sleep on one myself . . . not sure if it helps with frizz (I'm still working on that issue), but it does cut back on tangles.

I got a set of two at TJ Maxx for 5.99. Gotta love the discount stores!
CG since 10/5/08
Faux Red-head since 1997 - recent henna head
CoWash: Suave Naturals Tropical Coconut
Conditioners: L'Oreal Vivre Pro Nutrigloss
Winter Stylers: KCKT, KCCC, FOTE, BRHG, Boots
Summer products I'm missing: CK, re:Coil, Tweek
Techniques: single plop, pixiecurl diffuse