I have had partial second-day hair success with two things: sleeping in a loose french braid, canopy only, and then in the a.m. refreshing with a homemade spray with honey and olive oil. Just spray and walk away--it's kind of amazing how the waves just reform themselves out of the pouf. You have to be careful not to overdo it, though, because too much of that stuff will get tacky and attract dirt.

Our hair is different, though, so you your experience may vary.
Type 2c: coarse, high-density, low porosity (so it would seem)
Avoiding protein and glycerin; going for soft, non-crunchy, frizz-free waves
CO & RO: Tresemme Naturals Moisture
Sealer: Olive oil
Leave-in/Styler: Kinky Curly Knot Today
DT: olive oil and honey