If you are sleep deprived, you will probably find it a lot harder to lose the weight because your body will release cortisol as well as other stress hormones which promote weight gain. (newkidscenter.com)
We will have other stresses in life especially from our job. (adultfindout.com)
Other stresses on your cat's body such as fever, shock or surgery can also cause the hair to stop growing within 1 to 3 months of the problem. (cat-health-guide.org)