The purpose of the present study is to evaluate the effect of sleep duration on weight loss of obese and overweight adult when they are in a weight loss plan (NovinDiet Protocol). The investigators aim is to compare the effects of short term sleep duration with normal sleep duration with respect to body weight (and abdominal adiposity).

Inclusion Criteria:

• Must be female
• Must have < 7 hour sleep per night
• Must be 18-45 years of age.
• Must have Body mass index (BMI) between 27-35 kg/ m².
• Must be able to have moderate exercise.
• Must be interested to have weight loss.

Exclusion Criteria:

• Participating in a research project involving weight loss or physical activity in the previous six months.
• Pregnancy or lactation during the previous 6 months, or planned pregnancy in the next six months.
• Taking medication that could affect metabolism or change body weight.
• Report heart problems, chest pain, and cancer within the last five years.
• Smoking
• Menopause
• Diagnosis of any chronic disease such as fatty liver, cancer, chemo/radio therapy, heart disease, immune compromised conditions, abnormal thyroid hormone level.