Incomplete dominance is a of two phenotypes, but codominance is a of two phenotypes.

both alleles in the heterozygous genotype are exhibit in the phenotypes.  Allele is completely dominant over the other, and  it is the phenotype is a blend of the two homozygous phenotypes, there are more than two forms of the same gene, and there maybe one more superior form and several different phenotypes

cramming before a final is bad because it makes a student's stress level higher. students who embrace cramming to get through a final exam week find themselves struggling to perform consistently, once the brain adjusts to prolonged sleep deprivation.