Two things are probably involved depending on where you live--weight of hair pulling out the curl and lower dewpoints because it's that time of the year (heat on in the house also works against the curls.)
A good haircut might help. You can have longer layers to "lighten" things up. The other thing is to add more moisture to counteract the dryer air.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; DM MiraCurls Curling Gelly; UFD Curly Magic; Shescentit LIs; Sevi conditioners; Botanical Spirits Puree, CJ Repair Me